Telkom won't let me leave!

<p>Telkom has informed me that they are no longer providing a service in my area. It is a rural area and according to them, the cable theft is too high. They now, however, will not allow me to leave. I have sent 3 emails requesting that I am no longer receiving their service and yet I am still receiving a tax invoice monthly asking for money for a service I am not receiving. When I go to the Telkom store near us, I am told they do not deal with fixed lines and I should phone my compliant in which usually ends in hours of waiting on hold with no response. I am now worried that I will get a poor credit rating due to Telkoms inefficiency. I am hugely disappointed. How do i cancel my service!?!</p>