3 Months and no repair, logged calls keep getting

I have had various calls logged over the last 3 months for my ADSL service. The first technician to arrive got the service working, albeit with very bad latency and at times almost unusable. He said that the cable from the pole to the house needed replacing and someone would come back to fix it. Nobody did, Call closed. I have since logged a number of calls, technicians phone me, tell me they will come to the house, never come to the house and then close the call. Very frustrating. ADSL works some days, other days completely unusable. Worst thing is Telkom charges full rates for a service which is not being given. Would like to switch to wireless broadband, but if this is the service from Telkom, then I fear another poor service at a more expensive rate.