No phone line again

For the 10th time this year I have no phone line - my previous complaint about Telkom was that I had no business phone line for months. The line went down on Thursday and we have yet to receive any communication from Telkom after the fault was reported. The waiting period on the phone to telkom is nothing less than 30 minutes and then the very friendly operator cannot be of any assistance at all. How do I get Telkom to fix this line for once and for all so that it does not go down every few weeks?