Landline cannot be cancelled

Telkom is a very poor service provider.

I have cancelled my Telkom Landline at the end of December 2017 and still receive invoices every month. I have tried to query my charges for months now, but nothing gets done to fix this and the invoices just increase every month.

I have visited the Telkom shop a number of times, spent hours on the call center line and sent over 50 emails with absolutely no progress whatsoever. Everyone simply refers me to the next person who doesn't do anything more to help.