MTN non-responsive

MTN has ceased communication with me regarding canceling my contract remotely. I no longer live or work in South Africa, and they refuse to reply to my emails to please cancel my contract as I have finished the payment term. I am unable to reach them on any platform and debit orders continue to go off. I'm posting here because I am helpless to do anything about the situation until I can return to South Africa in 2023 and I've run out of options to try and remedy a solution.