Incorrect debit

My contract for the OPPO phone expired in September, following the completion of the 34-month payment term. Vodacom's customer service confirmed the contract's end date and stated that September would be the final debit. However, I have been incorrectly charged R300 in October and November. I request immediate attention to resolve this discrepancy and prevent future unauthorized debits. Kindly return the money you incorretly debited from my account.