Contract cancelled but still being debited

On 23 Nov 2021 I requested a cancellation of one my contracts. I followed up the beginning of Jan 2022 to find out if it was done. To my dismay I was told that my contract ends in Feb 2023 - I took out this contract about 6 years ago.....what!!! After a number of calls and email correspondence (and a MTN complaint process) I was told that it will be cancelled and back dated to Nov 2021 - as there was a mistake on their side (I have the email correspondence). I checked my bank account on the 1st Feb 2022 and to my utter horror, I see that my account has been debited yet again. I am tired now of wasted time AND AIRTIME.