I stayed in Cityview Apartment Downtown St Louis f...

I stayed in Cityview Apartment Downtown St Louis from March 2013 to July 2016. I vacated the apartment after paying all my dues and was waiting for my security deposit to be refunded. After two months when I inquired they informed me I never paid security deposit and I have to provide them payment proofs for them to consider my case. I provided them my lease document which clearly shows security deposit they hold with them. Now they are not honouring their own lease document which was prepared and signed by them.
This is cheating to forfeit the security deposit on grounds its not in their record. I would have been satisfied if they deduct or forfeit my deposit on basis of any false damage to their apartment. But this is Scam. I feel sorry staying there.