Product: Debt collection

I tried to dispute this charge from XXXX XXXX for months now since I dont owe any debt. Ive given them a dispute letter below : The XXXX XXXX Apartments claimed I owe {$1500.00}. I am disputing this debt because I was wrongly charged a bill that does not represent the state of the apartment, my monthly rental payments, or any other agreed upon expenditures within the lease agreement. The lease agreement specified that I was not to owe them a security deposit upon moving in. My statements reflect that the rental payments I owed to XXXX XXXX have been paid in full and on time. The apartment was in good state when I departed, I recorded a video of the apartment room as evidence to show that the rooms were undamaged and did not require repairs at the end of my lease. I gave them more than 60 days notice that I was moving out and would not be renewing my lease or staying any longer than the specified terms of the agreement, my keys were given back on XX/XX/XXXX. Prior to moving out, nobody came to inspect the room from XXXX XXXX. I was never informed of any damages to the apartment, any terms that had been breached or an extension to the lease agreements duration. This is the first time I have received news that I supposedly owed XXXX XXXX for charges they have yet to explain to me. When I received this list of charges I had already moved out and paid my final monthly payment of rent. The itemized list of charges I owe also do not align with what I was paying for previously. The Rental Income charge issued in their letter to me is not the same amount I was paying for rent at the time, their charge was {$780.00}, my agreed rental payment was {$840.00} per month previously. Furthermore, the total balance due at the end of the letter sent to me by XXXX XXXX does not mathematically add up to their itemized charges. The list of charges comes to {$1100.00} while the letters Due Property listing claims that list of charges equates to {$1500.00}. I have contacted XXXX XXXX multiple times including visiting in person at their offices and have not received any form of reasoning as to why they believe I owe them {$1500.00}, or even {$1100.00}. I have attached all related documents and correspondence, including rental payment confirmations, the original lease agreement with highlighted sections including the lack of security deposit, proof of my notice to them that I would be leaving, receipt of their acknowledgement of the return of the keys from XX/XX/XXXX. With couple if weeks later, they sent out a letter saying I still owe the money without any real reasons as to why. Ive been in contact with XXXX XXXX and theyve in writing forenamed that I dont owe anything. They sent me a ledger and an email stating that I dont incur debt. With that, Ive sent all my evidence to XXXX. Data last month and have not heard from them. The interest for this debt is still going up and nothing is being resolved. They are unprofessional and is a scam. They have charged me for an additional months rent with hidden fees that I have never seen before. I have contacted them many times and have not had any luck until recently, which they stated I have not owed any money. I have tried to dispute this through their collection agency, I.Q. Data International, and had no luck. These are my evidence about my complaint that I just put through. This email is stating that I do not owe any money. Attached to this file is a ledger showing all my monthly payments in a timely manner and that I clearly did not owe any money once I moved out. I have complained to the Attorney General and they said they could not get ahold of XXXX XXXX XXXX I have also complained about this to CFPB and got a letter back from I.Q. Data Inc. that they would dispute it for now. Why is interest still occurring when they said they would dispute it?