Cancelled line still billed, 120 min on call!!

I cancelled my Telkom line in June but now have received another bill. I have since moved from the property.<br> <br> I called the retentions line held on for 45 minutes the line was answered but no one spoke, I could hear people in the background and noises but no one responded. I called back and have been holding for 30 min!!!<br> <br> Please see why my line has not been cancelled as requested reference was ***A