Not a service champion.

Definitely not a service champion in my opinion!!!! I cancelled a contact 31 October 2020 at 12h49...as per my cancellation noted on MTN"s system. I still to date get charged exorbitant amounts (and we are now in March 2021) I am on the phone between 1 and 2 hours querying this with MTN. I have been in store twice (East London) where it is being ' escalated to the manager.' ... Well, I still wait for 'the manager' to phone me back. I honestly do not know what else to do to get this resolved . MTN has my cancellation noted on the exact date and time I did it.... But yet I am still being charged every month. Hoe many 'service champions' is it going to take to speak to... to finally get a champion to sort this out???