still debited after cancelled and not renewed contract

I have cancelled and not renewed my contract that ended April 2018, but following the procedure given by you guys to cancel which I did in April 2018. Telkom keeps on debiting me to date. The contract has been cancelled only a couple of days ago. So my concern is why debit for a product cancelled and utilized from my side... I would like my money back for the debits after the cancellation because technically we are out of contract and you are receiving money for a product I have not signed for. Feedback is terrible from three employees who do not respond at all after days of politely asking for feedback or a resolution. ********** 295