Delay on Canceling Contract but will ***** extra funds

In November 2022 I requested my contract to be upgraded for their black Friday sale, in January 2023, the courier company delivers my device but I was unable to get the device because MTN could not verify my finger print. I then requested to cancel 1 of my contract and return my number to Prepaid, this was done in January 2023 because I was not going to wait 3 months again for a device . I spoke with the consultant and advised that it will 30 days to cancel the contract, we are now in March and they still did not cancel the contract but they are fine to ***** in the form of the monthly debit from my account when they should only debit for my account. MTN is using the 30 days advance notice just to ***** more money when they are already the most expensive self phone provider and they still have the audacity to get the consultant to phone me to do an upgrade. I gave MTN 1 more chance when I spent over 1 hour at they branch at fourways mall to check for an upgrade but they did not have the device, I then asked to change the OTP, the consultant and failed to the change because of the incompetence of the MTN Heads who allows the servers to be separate, which makes it so we can not go into the branches to ask for help, we must phone in and at the end they say give it time. So cancel the contact that is on review for cancelation for well over 30 days and refund the extra debit amount you stole when debitting the other contract which I will also be canceling when the contract is up. MTN is really run with incompetence at this point.