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                                                                   EXHIBIT 10.55

                              ASSUMPTION AGREEMENT

This agreement has been entered into by ITC Holding Company, Inc. (Current
Lessee) and Knology Holdings, Inc. (Replacement Lessee) to effect the
assumption by the Replacement Lessee of the lease of 312 West 8th Street, West
Point, GA which is currently under lease by the Current Lessee from Midtown
Realty, Inc. (Lessor).

The Replacement Lessee agrees to assume all the rights and responsibilities of
the aforementioned lease (copy attached) effective November 1, 1999. All future
lease payments will be made by the Replacement Lessee to the Lessor consistent
with the terms of the aforementioned lease.

AGREED:                                           AGREED:
/s/                                               /s/
----------------------------                      ----------------------------
ITC Holding Company, Inc.                         Midtown Realty, Inc.

AGREED:                                           DATE:
/s/                                               11-9-99
----------------------------                      ----------------------------
Knology Holdings, Inc.
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PARTIES:    This Lease Indenture made and entered into this 1st day of December
            1998, by and between MIDTOWN REALTY, INC., 1706 Spring Road, Lanett,
            AL 36863 hereinafter referred to as "LANDLORD" and ITC HOLDING
            COMPANY, INC. hereinafter referred to as "TENANT".

                                   WITNESSETH

PREMISES:   That LANDLORD for and in consideration of the rents reserve to be
            paid and the covenants to be performed, has leased and by these
            presents does lease, unto TENANT certain premises in WEST POINT,
            GEORGIA (TROUP COUNTY) described as follows:

                  312 WEST 8TH STREET IN THE
                  CITY OF WEST POINT,
                  TROUP COUNTY, GEORGIA.

                  1,740 SQUARE FEET
                    310 SQUARE FEET COMMON AREA

                  2,050 TOTAL SQUARE FOOTAGE

RENT AND    To have and to hold the said property from 1st day of December 1998
TERM:       for a term of THREE YEARS, thence next ensuing, TENANT to pay
            therefore during said term the sum of FIVE HUNDRED NINETY-SEVEN
            DOLLARS AND 92/100 ($597.92) on the first day of each month,
            beginning with the first day of December 1998, at the office of
            LANDLORD shown above. All utilities and assessments will be paid by
            TENANT. 5% charge will be added after 10th of the month.

RENEWAL:    TENANT shall have the right to two - 3-year renewal options and
            shall indicate to the LANDLORD his intention to renew ninety days
            prior to the expiration of the original lease or first option. If
            the TENANT does not desire a three-year renewal, this lease shall
            continue on a month-to-month basis at the then effective rate until
            30 days written notice is given by either party to the other of
            intention to terminate.

USE:        Premises are to be leased to and used by TENANT for offices and/or
            related business type activities ONLY, TENANT agreeing that he will
            not put the premises to any illegal or unlawful use nor to any use
            which will increase the insurance thereon.

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                                                            -2-

REPAIRS:       TENANT has examined premises and agrees that they are in good
          state of repair, except in the following particulars, which
          LANDLORD agrees to repair promptly:
                                   NONE
          ------------------------------------------------------------------
          ------------------------------------------------------------------
          TENANT agrees to bear the expense of keeping the premises, together
          with any fixtures installed therein, in good condition, ordinary wear
          and tear excepted, except broken glass which shall be replaced at
          TENANT'S expense regardless of how caused, and except the expense of
          keeping open all water and sewerage pipes, electrical and heat pump
          if determined to be caused by neglect of TENANT or SUBTENANT. LANDLORD
          will be responsible for PLUMBING, ELECTRICAL, HEATING AND AIR as long
          as it is determined to be from normal wear and tear. At the
          expiration, premises will be returned by TENANT "broom clean" with all
          keys.

DAMAGES-       TENANT will give LANDLORD notice in writing, specifically
INJURIES: pointing out any defects in the premises which may arise subsequently
          and agrees that LANDLORD may have not less than ten days to remedy
          such defects. In the absence of such notice and until the expiration
          of said ten days, TENANT agrees that LANDLORD is released of any and
          all liability therefrom for injuries or damage to TENANT, his family,
          servants or guests, TENANT hereby specifically waiving any law of the
          State of Georgia in conflict herewith or requiring inspection by
          LANDLORD. If a member of TENANT family, a guest or servant recovers
          against LANDLORD under such circumstances, TENANT agrees to indemnify
          and hold LANDLORD harmless for such loss.

GENERAL:       Provisions with reference to remedies in case of default,
          abandonment, or bankruptcy, with reference to LANDLORD'S right to
          repossess, and with reference to waiver are shown on page 4 and 5
          hereof.  THEY ARE A PART OF THIS AGREEMENT.

NOTICES:       All notices provided for hereunder must be in writing.  Such
          notices mailed to or left at the within named premises shall
          constitute notice to TENANT, and notice to the LANDLORD shall be
          accomplished by like document to LANDLORDS's as herein shown.

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                                                            -3-

INSPECTION:    Upon reasonable notice of not less than twelve hours to TENANT,
             LANDLORD may enter premises for the purpose of inspection, repair
             or showing to prospective purchaser or tenant. After notice of
             termination of lease, LANDLORD may place rental signs on the
             property.

POSSESSION:    If LANDLORD is prevented by law or through no fault of his in
             giving possession on the date herein provided, there shall be no
             liability for damages of any kind resulting from such failure.

ADVERTISING:   All rights to advertise on premises or place signs thereon shall
             be reserved to the LANDLORD.

INTEREST AND   All sums due thereunder shall bear interest at 8% per annum
COSTS:       after maturity and if placed with an attorney for collection,
             LANDLORD may recover reasonable attorney's fees at 15% as cost of
             collection.

FIRE:          Should the premises be rendered untenable by fire or other
             casualty, the lease is to terminate. Rent shall not abate in case
             of partial damage which does not render the dwelling untenable, in
             which case repairs will be promptly made.

FIXTURES:      No fixtures are to be installed nor alterations and repairs are
             to be made by TENANT without the written consent of LANDLORD, but
             when so made shall become a part of the building including
             fixtures constructively attached, such as stoves and like
             fixtures, or others which are covered by written agreement, which
             shall be removable by TENANT at the end of the term; provided, all
             rent due under this lease has been paid and provided same can be
             done without damage to the premises.
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                                                             -4-

SPECIAL:               SPECIAL PROVISIONS OF THIS LEASE

             1.  This is a net lease.  LANDLORD will be responsible for
                 insurance, property taxes and exterior improvements. TENANT
                 will be responsible for utilities, cleaning service and pest
                 control. TENANT will be responsible for any annual increases
                 over $1,200 for property taxes and will be billed by LANDLORD.
             2.  Interior improvements and betterments will be made at expense
                 and liability of tenant with approval of LANDLORD.
             3.  TENANT has first refusal to purchase.
             4.  TENANT has right to sub-lease for like or similar business or
                 office space.
             5.  Space may not be used for wholesale or retail liquor or
                 alcoholic beverage distribution or sale.

                      ADDITIONAL PROVISIONS OF THIS LEASE

DEFAULT:       Upon failure of TENANT to pay any sums hereunder promptly, time
             being of the essence, or upon breach by TENANT of any of the terms
             of this lease, the balance due, hereunder for the full remainder
             of the term shall become due and payable at once by TENANT. TENANT
             expressly represents that all furniture, fixtures, appliances and
             equipment installed at premises are his property and that no
             furniture, fixtures or other property shall be removed by TENANT
             from the premises while any provision of this lease is in default.

ABANDONMENT:   If lease is in default and TENANT, his family and servants have
             moved from the premises, LANDLORD may thereupon re-enter take
             possession of the said premises, and furniture and other belongings
             of the TENANT which may be in same, without legal process, which
             will terminate any right of TENANT to re-enter.
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                                                             -5-

REPOSSESSION:  In case of abandonment of premises by TENANT, or following
               default, the surrender of possession on demand, or eviction by
               law, LANDLORD may retake possession immediately and the retaking
               of possession by LANDLORD, in absence of express election in
               writing to do so, shall not terminate this lease. LANDLORD shall
               have the right to recover immediately as damages, rentals to the
               end of the lease. LANDLORD in subletting premises shall be
               acting as TENANT'S agent to reduce TENANT'S loss, any net sums
               received by the LANDLORD to apply as payment on any judgment
               obtained of balance due. After same is satisfied, LANDLORD is to
               pay anything received to TENANT.

BANKRUPTCY:       IN case of bankruptcy, insolvency or receivership of TENANT,
               LANDLORD is to have the right at his option to forthwith
               terminate the lease and to proceed for any sum then due hereunder
               and also damages for the breach of said lease. TENANT waives and
               renounces for himself all HOMESTEAD and EXEMPTION rights of this
               State, of the United States, or any other State, and as
               additional security hereunder, assigns to LANDLORD as his
               attorney in fact to file claim for Homestead and to receive and
               accept same in TENANT'S name in any bankruptcy proceedings.

WAIVER:           If in any instance, LANDLORD shall allow a delay or suspend
               any provision in this lease, such waiver shall not prevent
               LANDLORD from insisting upon a strict observance thereof at any
               subsequent date.

                  Executed under seal in duplicate on the day and year first
               above written:

/s/                                         /s/
------------------------------              -------------------------------
                        TENANT                                     LANDLORD
     ITC HOLDING COMPANY, INC.                         MIDTOWN REALTY, INC.

/s/ Shirley K. Cohen
----------------------------(L.S.)          ----------------------------(L.S.)
                      ATTEST                                      ATTEST<PAGE>   1

EXHIBIT 10.56

[*]Confidential treatment has been requested for the information indicated
pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.
The copy on file as an exhibit omits the information subject to the
confidentiality request. Such omitted information has been filed separately
with the Commission.

                          INTERSTATE/VALLEY TELEPHONE
                         KNOLOGY CONNECTING THE VALLEY
                       DIGITAL CENTREX SWITCHING SERVICE
                         CUSTOMER ACCEPTANCE AGREEMENT

An Agreement made this 4th day of January 1999, by and between
Interstate/Valley Telephone Company of West Point, Georgia (the "Company") and
Intercall (the "Customer") located at 1211 O.G. Skinner Drive, West Point, GA
to renew Centrex Digital Switching Service.

Centrex Digital Switching Service (the "Service") is a telecommunications
system in which the equipment controlling the switching is located in the
Company's central office. Lines connecting Customer premises to the Company's
central office are furnished by the Company as part of the service, and remain
the property of the Company.

Customer hereby subscribes to the Service on the following conditions:

         A. CONTRACT TERM: Rates. Customer elects an initial contract term of 5
year(s), for service lines and with the features set forth on attached Schedule
A. The monthly rate for OPTION I PRIMARY CENTREX LINES IS $[*] PER LINE. The
monthly rate for a Centrex Virtual Facility trunk is $[*]. This rate is not
subject to company initiated changes during the initial contract term. Customer
shall also be responsible for payment of any initial nonrecurring charges,
(I.N.C.), as described on Schedule A. No portion of the I.N.C. shall be
refunded under any circumstances. Notwithstanding the foregoing, an End User
Common Line Charge, as provided in the Tariff, will be charged. This charge is
included in the per line rate and is not covered by this Agreement. Any changes
to the End User Common Line Charge shall be made in accordance with F.C.C.
Tariff. Such changes shall not be considered Company initiated changes for
purposes of this agreement.

         B. SERVICE ESTABLISHMENT CHARGE. A Service Connection Charge of $N/A is
applicable to the establishment of _____ Centrex lines, and features described
in Schedule A. No portion of the Service Connection Charge shall be refunded
under any circumstances. The Service Connection Charge includes charges for the
primary service order, line connection, and central office programming. If
customer elects to add Centrex lines, Customer shall be responsible for payment
of the applicable Service Connection Charges.

         C. LINE SIZE CATEGORIES. If Customer elects to reduce the number of
Centrex lines during the term of the Agreement, Customer may do so, but shall
continue to be responsible for the payment OF THE GREATER OF 75% OF THE
INITIALLY INSTALLED LINES OR THE ACTUAL NUMBER OF LINES IN SERVICE SUBSEQUENT TO
THE REDUCTION.

         D. BASIC TERMINATION LIABILITY AGREEMENT. If Customer terminates this
Agreement prior to the expiration of the contract term, a termination charge
will become due immediately. The amount of the termination charge will be equal
to six (6) months billing of actual Centrex lines in service provided the
service is not in the fifty-fifth to sixtieth month of service. In this latter
event, only the remaining months' Monthly Centrex line rate shall apply.

         E. CANCELLATION CHARGES. In the event Customer cancels this Agreement
prior to the establishment of the Service, the Customer shall reimburse the
Company for all costs and expenses actually incurred.

<PAGE>   2

          F.  RATES AND CHARGES.  Rates and charges will be billed monthly
based upon pricing schedules in Schedule A. Customer agrees to pay all charges
when billed. Charges not paid within 30 days of the bill date may be assessed a
1.5% per month finance charge and may result in termination of service. Centrex
rates quoted in this contract do not include tax. The Customer will be subject
to the State and Local taxes applicable for his locality.

          G.  WARRANTY AND DISCLAIMER.  Interstate/Valley Telephone shall use
its best efforts to ensure that the system is reliable and available to the
Customer at all times, provided however, Interstate/Valley does not make any
representations, warranties or covenants, either expressed or implied including
the implied warranty of merchantability and fitness for any purpose.
Interstate/Valley shall not be liable for incidental, special, or consequential
damages, personal injury, or commercial loss, arising in any manner out of the
performance on nonperformance of the services provided.

The State of Georgia shall govern this Service Agreement. The terms of this
Service Agreement may not be amended except in writing, signed by both parties.

INTERCALL, INC.                              INTERSTATE/VALLEY TELEPHONE

DATE: 4-1-99                                 DATE:  4-1-99
     ----------------------------                 ----------------------------

NAME:  Susan Ferguson                        NAME:  /s/
     ----------------------------                 ----------------------------

TITLE:  VP - Finance                         TITLE:  VP
      ---------------------------                  ---------------------------
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                                   SCHEDULE A

                           CENTREX SOFTWARE FEATURES

                         Call Forward - All Calls
                         Call Forward - Busy and No Answer
                         Call Hold
                         Call Park
                         Call Pick Up
                         Three Way/Consultation Hold/Transfer
                         Hunting
                         Intercom Dialing
                         Last Number Redial
                         Ring Again
                         Speed Call
                         Conference Calling 3 & 6 Party
                         Auto Dial
                         Message Waiting
                         Make Set Busy
                         Call Waiting
                         Multiple Call Appearance
                         Toll Restriction
                         Least Cost Routing
                         Music on Hold Software (customer provides source)
                         Direct Inward Dial
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                             SCHEDULE A (CONTINUED)
                                    PRICING

                              OPTION 1 (60 MONTHS)
                    TO BE APPLIED TO ALL ADMINISTRATION LINES

                    Rate per line: (60 months)$[*] per line
                    Centrex Trunk: $[*]
                    Additional Directory Numbers: $[*] each

                             OPTION II (60 MONTHS)
                      TO BE APPLIED TO RESERVATIONS GROUP

                   Rate per line: (60 Months) $[*] per line

                           CENTREX VOICEMAIL PRICING
                     1 - 50        $[*] per box
                    51 - 100       $[*] per box
                    101 +          $[*] per box

                           SERVICE CONNECTION CHARGES

     Service Charges Covering Moves, Changes and New Installs:

     $[*]  Service Order Charge for one order or multiples placed at same time
     $[*]  Central Office Charge for each new or change to existing extension
     $[*]  Premises Termination Charge for any new line terminating at
             customer premises

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