Telkom deductions after contract was cancelled

I am so frustrated with Telkom. I cancelled a contract in December 2020 and to my surprise , they are still deducting money from my account in April 2021.

I have queried this over four times already and each time I am told that this is the last deduction. I have spoken to two people today and they both told me the same story that I have been told over four times already and I told both of them that I want to escalate this matter , something they both ignored.

What I want now is the balance that I owed on cancellation of the contract vs the amounts that have already been deducted from my account since January. If there's money owed to Telkom I don't mind settling it as long as this will END AND THERE ARE NO MORE DEDUCTIONS FROM TELKOM .