Vodacom is a buch of sharks and don't have a clue what the are doing!!

Wft must I still do to cancel a contract. Phoned in June 2020 a month before my contract ended to cancel my contract. My was debited still afterwards. I then put a stop order in place to keep vodacom from debating my account. I phoned again and again to cance it and wit allotof time and effort got to someonewho escalated it. Vodacom said they would credit the over charges and refund me what was over paid. Only credit done was the ammount on the invoice that they couldn't take from my account. I was happy that something happened and did not mind the credit due to me. Now almost a year later and my account is piling up again and the contract has still not been canceled. Cant get a superviser or manager to assist. Was just on the phone with Vodacom for 58minutes and still don't have an answer. Very frustrated.