6 Months later and still Telkom wont cancel the service

My Telkom landline contact is 5 years old. I have been trying to cancel it since January (its now June) and despite numerous emails with the necessary cancellation forms and IDs etc attached, numerous phone calls, numerous store visits, I am currently still being charged for a service I have desperately tried to stop for 6 months. I have heard all the usual Telkom promises about my cases being "escalated to the manager", but as of today, the service is still active and I am still getting bills from Telkom. I will not use their service again!