The apartment I used to live charged me a lot for things I don't remember ever done. Like "chemical burn on carpet", which I'm sure I never did!!!
I didn't pay deposit because it was promotioni, but they just charge me over $200, and bother me by a lot of ways until I paid. I still believe I didn't do anything wrong, but I have to pay because otherwise my credit will be demaged (they hired some company to bother me and warn me).