Cell C refuses to refund

Cell C refuses to refund an amount to me that they undertook to refund in October. I reported the problem on 4 October 2021, received feedback on 2 October and they closed the query without any explanation on 13 October. I lodged it again on 18 October and on 20 October received a message that the matter has been resolved and the refund has been processed into my bank account. This never happened and upon querying it again on 18 October, I was told that the issue was marked as resolved on Cell C side, but that they had credited my account - after they undertook in writing to refund the amount. You cannot get past a customer consultant and if you are very lucky - an forced to become very rude, you might be put through to a team leader after being cut off twice. Management is hiding somewhere behind the call center curtain, refusing to deal with their own mistakes. I would love just to get a number to the person who actually cancelled the refund and decided to credit my cell c account