cancelled account but still being billed

I have moved to n new house and has called Telkom to inform them and to move the line. a technician came and told me that there is no Telkom infrastructure in the area. he advised that I will have to cancel the contract. I've send an email in July 2017 and received ref no. ********** 14 for cancellation.I still receive a bill every month despite my request to cancel.