CAN'T CANCEL MY VODACOM CONTRACT

We've been trying to cancel a contract for months now. We've been in a store where we were advised that the only way to cancel a contract was to call a cancellation number. We did. The first time the "systems were down" and they couldn't assist. The second time we spoke to an agent who said that the contract would be cancelled on 31/12/2020, however, at the end of Jan '21 the debit order went off again. Then we called again on 2/2/2021 at 13:32 (You can reference the previous conversation's date and time in this call recording). The call center agent apologized and assured us that this time it was canceled and that we'd be refunded for the months Jan and Feb (if the debit order went off again in Feb). However... AGAIN the debit order went off in Feb '21 and AGAIN in March '21. I don't know what to do anymore? Do I call my bank and stop the debit order? Do I contact my lawyers and open a case?