Rcs service complaint

I had a refund at CTM on 26 May,it initially showed in my balance but at at the end of the month it didn't reflect on my statements and my balance all of a sudden was in a minus. I phoned RCS,spend almost a half an hour on the telephone being put through from the one consultant to the next just to be told they can't do anything about it. I went back to CTM Boksburg,they confirmed with their accountant that it went through successfully and they emailed it through again. I also emailed through all my balances and the refund slip but still didn't get any response from RCS and it is still not rectified.