Paid up Acc not closed!

I paid up my acc on 3/6/18 after I phoned RCS to confirm the amt to pay up and close the acc. I paid the amt in full as per the call centre agent at the Game store in Key West on the same day. In July 2018 I started getting calls from debt collectors because of outstanding amts. I’ve spoken to SO MANY people @ RCS over the last 2 years. Abigail was first promising to sort it all out. Then there was Amaisiwe, Tsolofelo next. No response from any of them. In Oct this year I got through to Fahiema Davids. She promised she would see what’s happening and sort it out. Yet I have to CONSTANTLY ask what is going on NO FEEDBACK FROM ANYONE. Looking at the rest of the complaints on here this seems to be a regular occurrence at RCS!!! Can anyone HELP ME SORT THIS OUT??????? I don’t understand the big issue ALL your calls are recorded??? It should be easy!!