Cell C ********** debit orders after contract was canceled.

Cell C contract came to an end at the end of June called in to cancel as well, end of July I was charged for my canceled contract it is now end of October and for the pass 4 months I am being charged for a canceled subscription how is this possible if my contract has now ended and I called to cancel both contracts. This is ***** and I think I am going to open up a case for this.