Product: Debt collection

I previously lived at XXXX XXXX XXXX XXXX XXXX XXXX, CO XXXX. My lease began XX/XX/XXXX. Throughout my time their getting ahold of management was nearly impossible. The property managers regularly quit, phones would be disconnected, emails would bounce back and say the address was no longer valid. There were many safety concerns and things that had been promised were lied about. For example the building was supposed to be secure, but the lock on the outside door was broken and homeless people would regularly come and sleep in the stairwells and at XXXX point had taken over an unoccupied apartment at the time. After almost being assaulted, swat being called to lock down the apartment complex, and an attempt by the company to raise the rent, I submitted a notice that I would be moving out XX/XX/XXXX. This date was due to my lease not beginning until XX/XX/XXXX. I attempted to make contact with the last known property XXXX, XXXX, on XX/XX/XXXX to remind her I would be moving out and I submitted my notice. I then texted the phone number listed on the site on XX/XX/XXXX to offer to pay a pro-rated rate for the XXXX days in the hopes of leaving peacefully due to accounts of previous tenants when they attempted to move out. I finally received a response from a property XXXX who said theyd speak to me about the move out. When I was finally called I was told that Id be able to be out on XX/XX/XXXX and would not be charged for that month due to my lease start date. I hired movers and was out of the unit on that date. I attempted to call multiple times to have final walk through. No one showed up to the apartment. I came back on XX/XX/XXXX in hopes that someone would come to collect the keys and perform a final walk through and again, no one ever arrived. I have proof that I began a new lease on XX/XX/XXXX at a new property. On XX/XX/XXXX I received notice that there was rental collection on my credit report. The collections stated I owed the company almost {$2000.00} and included a ledger with the charges of rent for XX/XX/XXXX. My previous neighbor at the time informed me she witnessed new tenants move into the unit on XX/XX/XXXX. I have attempted to resolve this with XXXX XXXX on numerous occasions. They have told me it was reported that I did not move out until XX/XX/XXXX and due to this I was responsible for the full the rent even if new tenants had taken over the unit on XX/XX/XXXX. I offered to provide witness statements from my neighbor and people that helped me move. I offered to supply screenshots of my task rabbit account showing the dates I hired movers and the address they moved my property from and to. I offered to provide a copy of my current lease that began on XX/XX/XXXX. I offered to send in a screenshot I took showing that I submitted my notice to vacant before submitting it into the portal on the rental companies website. I sent in screenshots of email exchanges and text conversations as well as screenshots of the rental companies website proving the phone number and email belonged to the company. The collections agency refused to accept every single document claiming they could have been altered. In return the company has only provided a ledger showing the rental company billed me for XX/XX/XXXX, a month I did not live on the property. When I received the collections I reached out to the property and requested the collections be removed or I be given the keys to the property for the rest of the month. The company never replied and when I called the calls would go straight to voicemail. I have disputed this collections multiple times through XXXX and every time the collections company provides only the ledger as the proof that I owe the debt. The apartment complex had cameras installed after the swat team had to be XXXX. At no point has the company provided video proof that I still lived on the XXXX.