Telkom ****ty service

Last year June i took a lte route WiFi contract with Telkom, i have been struggling since then with them to debit my payments or to provide with with bank account details to make payment. at first the consultants in Telkom store could not locate me on their system. when I call the contact center they advise they have escalated to back office and back office will be in contact with me. i have requested in February for them to cancel and suspend the WiFi, the WiFi is suspended yet Telkom is still billing me.. What do I do? if no one can assist with taking a payment or provide me with banking details? the fact that they still billing me for something im not using and not activated. you hang on for hours just to get through to someone who is not able to assist you. I am disgusted with this **** service.