MTN even after 3yrs still gives the worst service ever

Opened a month-to-month contract with MTN on 27/08/2025 and paid R634 via the MTN website using my card. Got their invoice via Pay Gate confirming that payment was received. There was an issue with my fingers not reading on their Biometrics and instead of having to battle further, I requested for the contract to rather be cancelled on the 03/09. Since then, it's just back and forth messages with MTN asking me for proof of payment which was already shared with them in more than one occasion including their own invoice reflecting the R634 paid. To make matters worse, this morning I received my credit report on Nedbank, and MTN is suddenly listed under my account and not only that, that there is a monthly instalment of R2651 with 6 missed payments? How can I have 6 missed payments on an account I did not even proceed with? I need confirmation urgently on when the refund will be done, I need confirmation that this contract is cancelled and my information from Credit Bureau corrected urgently. This is not the 1st time I have to fight MTN. 3yrs later of giving them a break, again they just cannot deliver on service. Had the same issue with them 3yrs ago. I guess they don't deserve to be given 2nd chance