Cancellation bad service after I immigrated. Vodacom Costumer Services useless

In Feb 2021 I contacted Vodacom Cancelations to cancel my contract as I immigrated. They provide me with a quote via email to buy out my remaining contract. I accepted the quote paid the money, and rep**** with proof of payment and to go ahead with the cancellation. Two months later, I still received bills each month. But no money going off my account. I phoned them again to check and confirm that my contract was cancelled and it was an administrative problem with their system and I can ignore the bills. This month (Oct) they try to debit money from my SA bank account which is empty as I'm in process of closing the account. I phone them again and now they say the contract was not cancelled and all kinds of stories, customer service department are absolutely useless. Unwilling to listen or help. Cost every time lots money the phone to them and we not getting any further. Still not resolved.