Extremely disappointed

Im giving MTN a 1 star rating, especially the for the Customer Care team. In May 2020, MTN had a system glitch whereby they were double debiting certain accounts. Unfortunately mine was one of them. I reversed the debit, and went in store to pay the correct amount due. For the months of June and now July, MTN are still debiting more than what they are supposed to, resulting in me having to reverse the orders, and pay via EFT. Its has not been 3 months and I have yet to receive a call, or some sort of resolution to this. I am extremely dissatisfied with the service and intend to cancel once my contract has expired.