Telkom refusing to cancel a landline!

I emailed my request for landline cancellation to servcancellation@telkom on 26/7/17. I received an acknowledgement of my email. I also received a call, requesting that I request my third party provider to release my broadband line so that the landline can be cancelled. This was done. The line was not cancelled. I have called Telkom customer service 3 times, each time hearing that I must email my request again, to the same email address, and that it will "receive attention". It is now 1 October and the line has not been cancelled. Telkom is however quite punctual in sending me the bill for this line every month.