Totally dissatisfied once again MTN

Can someone from MTN please call me ASAP before I lose my freakin mind! I settled my account on the 28th of April this n was only left with a Sim contract and I wrote a review about that as I was having problems getting through to retentions to cancel my contract but I kept on trying until I got through n I was sent an sms that an agent will be on contact to confirm my cancellation,I waited and waited until I decided to call again and finally they confirmed the n the 12th of May and nobody said anything about owing anything and I don’t why I should be owing since I was given the settlement amount by you and you the one who kept dropping my calls as I called a day after a settlement and you can verify that with the recorded calls you guys have,but nonetheless if I was owing why the lady that I spoke too to close my contract didn’t inform me?why close my contract and confirm with the SMS on the 12th that my number is now prepaid!comes the 25th of May I was billed R2200 and obviously I reversed it coz of have never had a contract with MTN that has that installment I only had one contract with them left and that was a sim contract that I’m currently paying and they weren’t gonna cancel the phone contract if I still had pending fees that I knew nothing of!and now I just woke up to this “Y'ello! Your services will stopped in 1 day and you'll be reported to a credit bureau if MTN doesn't receive payment of R 2875.16. Pay in-store or via your bank and use billing profile BA*** as a reference. You can find the banking details on your invoice.”what on earth?can someone please tell me what the hell is going on so I can also contact my attorneys and escalate the matter to ombudsman.the stress you causing me in the middle of a pandemic is uncalled for