Product: Debt collection

The following paragraph outline my reasons and history with Diversified Consultants and XXXX XXXX regarding an invalid attempt to collect fees. 
My XXXX account began as an employee account when I worked for XXXX PCS as a supervisor and sales person in XXXX, IL. I started receiving service in XXXX, IL then moved to XXXX XXXX, VA, then XXXX, VA, then XXXX, GA, then XXXX, GA, and finally XXXX, FL. My first address in XXXX was in zip code XXXX. I moved again to another part of XXXX, FL zip code XXXX. All areas in which I have resided are included in the XXXX coverage map. After moving to our home in zip code XXXX my husband and I begin to experience dropped calls, failure to connect at all, disconnecting from the network and thus showing the wrong time on the phone etc. Both lines of service also did not function at our places of work in addition to not working while at home. When we called XXXX to report the ongoing issues they had us update settings through a pushed update then when the issues continued they shipped us a signal booster for our home. The booster was connected to our service through XXXX XXXX. 
Once our new client discount for XXXX expired and the cost of our internet service and television shot up to over {$180.00} per month. After reducing expenses elsewhere in our budget ( I had experienced a layoff and my new employment paid less than my previous job ) we determined that it was necessary to cut our cable service. Like many other people of our age group we do not watch live television but rather stream our television on-demand through services like XXXX and XXXX. XXXX  charges a premium for internet only service so we started to explore options like internet hot spots through mobile providers. In fact, we had a XXXX USB hot spot to connect my laptop while traveling for work. Unfortunately, XXXX did not work in our home so it could not serve as our internet/data streaming solution. 
In addition, once we cancelled XXXX the mobile service that was being boosted would no longer work and we wouldnt have call ability either. Because we could not get service at work or at home and service at home depended on us subscribing to a third party for cable internet service, we were forced to cancel service with XXXX and transition to a new provider. Before switching services, we called XXXX customer service and notified of our intent to cancel and discussed the need for cancellation fees to be waived because XXXX was unable to provide service. I cited to the customer services the policy to waive cancellation fees if XXXX is unable to provide services at home and places of work ( I used to work there and was familiar with the policy ) and how without XXXX services, XXXX could not provide service at my home. Service was cancelled in XXXX of XXXX at the end of billing cycle. All phone bill charges were paid in full. The remaining charges could only be from cancellation charges. 
XXXX never sent a notice or bill for any unpaid balance after the account was closed. It wasnt until over a year later that I began receiving collection calls. I informed the collection agency that I contested the validity of the charge. I did so verbally and returned a letter I received after the call with a reply that I contested the validity of the charge. I continue to assert that the fees charged by XXXX following cancellation and the collection efforts by XXXX XXXX is invalid.