Huntington Ridge Apartments

My lease agreement expired in June after which I vacated the said premises after duly notifying the apartment manager ( day before lease expiration) Today I got a letter in the mail from a collections company saying I owe $ I do not owe this amount of money and I believe I am a victim of extortion
When I left the apartment complex I was told that I owed about $ The basis of the amount was questionable but I decided to cover the chargeThe apartment was supposed to offset my security deposits of $and I would pay the remainder That was the last conversation we had on June 03, I attempted to reach out to them in several occasions to complete the rest of what I owe to no availThe only other correspondence I got was the letter from a collections agency stating that I owe $
Product_Or_Service: Rent