Complaint sub-issue: Attempted to collect wrong amount

Dear Sir / Madam, My name is XXXX XXXX and I live in XXXX XXXX, FL I have a business in XXXX XXXX XXXX, Florida. 
Every year my family and I fly to XXXX XXXX XXXX for two months in the summer. 
Every year I rent an apartment for two months and pay the Termination Fee ( another two months in rent ). 

I made an apartment rental agreement with XXXX XXXX XXXX for {$1700.00} per month. 
At the beginning of the process, when they just showed me the apartment, I told them I was coming with my family for only 2 months, I told them I had a house in XXXX XXXX, FL and I was only coming for 2 months, I asked them if it was okay, they answer " Yes, if you will pay the Termination Fee '', I said " I will sure pay. " I was very transparent. 

I immediately paid a deposit of {$1700.00} and a rent for XXXX of {$1000.00} plus other fees of {$410.00}. 
We moved in on XX/XX/XXXX. 
The agreement states that if I want to terminate the lease, I must give them 60 days notice. 
I sent the 60 day notice on XX/XX/XXXX by email ( see attachment A ). 
On XX/XX/XXXX my family and I left the apartment and my staff cleaned the apartment and painted it, we brought it to the same condition as we got it. 
I returned the apartment on XX/XX/XXXX after my secretary came into the apartment with a XXXX XXXX employee and checked everything, a XXXX XXXX employee said she would only have to charge us for the curtain, which is {$70.00}, The apartment is great. 

The total amount for 4 months is {$7000.00} + {$70.00} = {$7100.00} Less {$1000.00} paid upon entering the apartment. 
Less security deposit of {$1700.00} Less {$1700.00} paid for XX/XX/XXXX Balance to be paid {$2500.00}. 

I did my best to resolve the issue with XXXX XXXX XXXX but unfortunately they just don't want to meet me or discuss the bill. 
They have a phone number on the bill statement if the payee has any concern, but XXXX XXXX is not really trying to resolve the issue. 
My secretary went to them office to talk with the manager, Ms. XXXX, a few times because we couldn't catch her over the phone. 
I called Ms. XXXX by myself so many times and she get on the phone only twice, at the first time she said she is busy and she will call me back later and at the 2nd time she said she has a Dr. appointment and she promises to call me back, SHE NEVER CALLED ME BACK. 
I did search on XXXX and i found the headquarter office of XXXX XXXX XXXX in CA, i called them twice but they didn't answer so i left a voice message twice, and THEY NEVER CALLED ME BACK. 

The collection company is demanding XXXX from me. ( Of course this is not true ). I would like to point out that they have been calling for about month and a half and I explain to Ms. XXXX ( IQ DATA Collection ) that this is a mistake, and that I owe much less and I am willing to pay the correct amount, But I don't want to pay over what I need. 
She was so rude, She didn't believe any word I said, She said i am lie, She ignored me during the call, She didn't want to check with XXXX XXXX if I am right, She didn't want to calculate the bill with me, She blamed me and insulted me and said " You don't have the money to pay, right? just say it, you don't have money ''. 
And from the beginning they endlessly threatened to knock my credit. 
And indeed they did and knocked me the credit. 
And thats why credit card companies have drastically reduced my credit line by two cards. 
In addition, I lowered my credit score by 149 points which causes me immense damage. 

I am asking IQ DATA to remove any collection from all three credit bureaus immediately, And send me a letter of complete deletion of this matter.