poor service

We've been experiencing an extremely noisy telephone line for the past month. we have reported this to Telkom 3 or 4 times telephonically and once online. messages have been sent to us from telkom saying the complaint has been handed to the technical department and it should be resolved within 2 days. A guy showed up at our house once and said our problem has been fixed...it was but only lasted for a day. The last message we recieved from telkom was last wednesday. Currently our telephone line is completely dead. We will refuse to pay rental of a phone when we have been unable to use it and have spent lots of money on cell phone calls as a result thereof.