MTN

I had a contract with MTN for 24 months I called on the first week of March last year 2024 to cancel my contact because that is a process I spoke to a guy who assisted me and sent me a text message to confirm that the cancelation went through. 3 months down the line I receive a text that I am owing money it was around R350 I immediately called spoke to one of the agents again who then said one of the supervisors will give a call back okay I said cool. I never received a call again I called requesting now to speak to a supervisor I did manage to speak to one she promised that she will listen to that call I made when I requested to cancel the contact she never called me back. Yesterday I was at one of their shops i was told that my account has been handed over to a third party legal company. My question is that how?? When I called in to cancel the contact and one of their agents confirmed over the phone that my last payment will be the end of May. They say their calls are recorded why are they failing to listen to that called. MTN you guys are ****mers who are ruining people's life my credit score is affected because of this each and every time when you call they will transfer you from this department with out solving your query the is no first time call resolution!!!