Failure to respond to technical fault

i have called telkom on numerous occasions to repair a syncing problem on our buisness adsl line. We have a 10mb/s adsl line but the test prove it is only syncing at 3.76mb/s. They have given fault references and when you call they tell me there is no such reference. Now 2 weeks later they say thay are following precedures to sort this out but 2 weeks on a buisness line is ridiculous. They always tell me a technician is busy with the problem but the technician for our area doesnt even know about the problem. 2 weeks prior to this fault our internet was down for 2 weeks. We have a medical practice that relies on fast internet to submit claims. Cant run a buisness this way