contract termination

I used to rent a flat under zelri properties and I put a notice to move out during May 2015. To my suprise I never received my deposit and decided to keep my cool on that and now every month since I moved out I get invoice for rent . I called them and told them that I moved out and they said ok but to my suprise they still sending me the invoice and recently they said they blacklisted me because I am not paying the rent. This people still have my R4200 rent and yet they say I owe them while they are the ones owing me. I want them to take my name out of that blacklisting list and move on. The way am so enough about them I don't even want them to contact me about MY deposit,they can keep and let's see if it will make them rich.because they are used to robe innocent people their monies