Bad service, ignorance , refusal to refund customers

I made an error with the dstv account number. I phoned and was on hold for the whole hour & told to submit “proof of payment” when i did i was told “its not proof of payment bcz its a bank statement” . I told them but i used my credit card to pay and the record is my bank statement, i was told “no we accept proof of payment only not bank statements”. I phoned 3 times again being put on hold for an hour . I am asking for my refund, wrote emails even went to their nearest branch and recieved the worst kind of service . It’s been over a month now still no response from multi choice