Telkom won't cancel my contract

I cancelled my telkom mobile contract in December 2017.since then I have been debited every month.i have cancelled my contract since then in store ,on the phone and via email.i always get the same response "we will escalate this issue,someone will confirm cancellation within 24 hours" which never happens. I need a refund of all my money.if I reverse the debit order it costs me R200 and the next month the deduct double plus extra I will be contacting ICASA TOMORROW.