Bad cancellation service from Telkom

I have been trying for two months to cancel a Telkom line. I phoned, and after holding for 20 minutes a consultant eventually picked up. I told her that I want to cancel due to the user of the account relocating. She said that I must send an email with the necessary documents. Which I did. I got an automatic reply stating that the request was received and that I will be contacted within three working days. Two weeks (10 working days) later, no one has called me. I phoned them again, just be informed that the call back to confirm cancellation can take up to 30 working days. This is completely unacceptable, as no one is using the service anymore, but they are still billing us monthly.