Blacklisting people ********

I stayed in afhco flat nukerk in 2015 and moved out in 2016 without owing any rent and they didn't give me back my deposit only to find out today since I'm looking for an apartment that they listed me as a bad payer when I call them they are saying I don't owe them my file went into a wrong place but still they can't help me to remove my name and they stuff is so much rude I wasted my R300 airtime only by today trying to resolve this issue