Product: Debt collection

This is a classic case of a newly acquired apartment complex remodeling a unit and attempting to charge the prior resident. I was paying hundreds below market rent because it wasnt an upgraded unit. This is why after 4 years of excellent tenancy, they suddenly didnt renew my lease, and refused to explain why. 
Upon move out XX/XX/XXXX of XXXX, I did a walkthrough with " XXXXXXXX XXXX  '', the office manager and a maintenance crew man. At that time, I was not given anything to sign in regard to responsibilities to move out costs. I handed her my keys and then I was emailed an excel spreadsheet of alleged charges. Immediately upon receipt, I began disputing the carpeting, some of the cleaning charges, and the painting. I attempted to work with " apartment complex '' after I moved. I left a forwarding address with " XXXX XXXX '' the complex manager. They would not discuss it with me. I left a message on XX/XX/XXXX, stating I would start making payments however I wanted to discuss the charges first before beginning payments on what I did not owe, because they could not charge me for monsoon damage and for something I had been requesting to get done for two years. I heard nothing back. There was contact again around end of XX/XX/XXXX. I agreed to go in and discuss, however I was advised that any and all communication needs to be in writing. So, as you can see from the screenshot of the e-mail from XX/XX/XXXX, that I requested communication be via e-mail. I waited for a reply however, that never happened. The next communication I receive is from National Credit Services. I did make two phone calls to the debt collector in XXXX of XXXX attempting to discuss charges that were not mine. I had agreed to send in the documents I had. But then I contacted an attorney through XXXX, XXXX, XXXX and XXXX who advised me to no longer speak with the debt collector directly until further notice, nor send any of my documents, including video footage upon move out. Arizona tenant law states that I can not be charged for painting after four years of tenancy, even in the event my walls were dirty. But they were not and clearly by the video. The letter to National Credit Systems states that I have verified proof that I continued to ask for the carpeting/flooring to be replaced due to monsoon damage, while I was a resident. The attorney also states that maintenance and management failed to do their due diligence to make repairs while I was a tenant. The letter that is included, from the attorney to National Credit Systems, specifically states that they need to send specific documents including any signature documentation of me claiming responsibility for these charges within 30 days. National Credit Systems failed to do so within the 30 days. There was no signature by me. Per the attorney, they must cease and desist all collection attempts including reporting to the credit bureaus. I filed disputes with all three credit bureaus on XX/XX/XXXX with the letter from the attorney, and my removal request was denied stating the debt is valid and updated. The debt collector did not comply with the attorneys request furthermore, the " apartment complex '' violated the lease agreement when refusing to repair while I was a tenant and charged me for items that by law can not be charged. I need this matter resolved and removed from my credit.