Incorrectly debiting my account for a none existing contract

I had wife contract with Telkom that expired in August 2021 and opted for month to month option whilst was shopping around for suitable ADSL, and stopped using their services in October 2021, sent mail to notify them that they can cancel my subscription, to my surprise it was not done, account was debited, call and spoke to an agent who informed that there was a balance of 209 that needed to be debited, I agreed that they can debit that outstanding amount, well guess what an incorrect 418 amount was debited reversed it and sent an email, following month again an amount of 829.70was debited again, Jan an amount of 1042.70 was debited after i have called again to request my contract to be cancelled,

i have sent numerous emails to an email address their agent gave to me and till this day my account is still debited and no response from them, Instead my credit score is affected, Today i called again 10213 their agent gave me a number to call guess what its invalid!!!!