Pathetic lack of Service

It is very difficult to complaint about "Service" if there is "NO SERVICE" - frustration, frustration, frustration... I battled for a long time to get a Telkom landline cancelled, I did an online cancellation, the line however remain connected, I went to Greenstone Customer Service Branch, wrote many e-mails, were even charged a "Reconnection Fee" for a service that was supposed to be cancelled, eventually the line was disconnected and I was happy that everything was finally resolved... unfortunately not! My aged mother in law in an old age home is now being harassed and threatened constantly by rude VVM staff members. I spoke to Nomthanda 13/07 & sent e-mails detailing the long history with cancellation. On 30/07 I requested an acknowledgment and progress. on 7/08 I spoke to Thami whom claims it is still being investigated and will take 21 Days. On 21/08 I spoke to Patricia and asked that a note be made and the harassment be stopped. She claimed that it is an "automated" service and cannot be stopped, she will however make a note. The calls should be ignored.. (??) The threats however continues. On 21/08 I e-mailed the "Complaints Manager," to date still no response or acknowledgement. This is really pathetic!! What more can be done to resolve this??