Mtn Bad Customer Service

On 4 Sept 2020 I made a cash payment at the Zevenwacht Mall branch which was done on an incorrect billing account linked to my Account. Since then MTN is not refunding my money instead its as if the payment never even happened as I was debitted twice in November due to the 4 Sept payment that is not reflecting on my account. I am now being sent back and force for my reversal which was promissed to me by the call centre. I even have a confirmation email stating that I can go to the branch and a reversal must be made. The Branch says they cannot refund me. So MTN is sitting with my money to the value of R468.01 which now feels that they do not want to refund me with. I have never been so disgusted in how they operate that is litterally *****ing money that they getting rich off from. I have logged queries even went to the Branch for assistance but no one is coming back to me. I have now intern cancelled 1 of my contracts with them due to this incident and plan on doing the same with my current one. MTN you suck