Line canceled but chewing goes on......

I have requested Telkom to cancel my line on the 2nd October 2017.I have app**** on line on telkom website and also sent a cancelation form. I had a call from telkom to confirm my cancellation and was promised a refund for monies over charged. It is now the second payment after cancelation that telkom is debiting my account via debit order although my line is canceled. If you plan use telkom, watch it. You might no be able to stop there charges. it happened to me for the second time now. A new way to make some extra income?????