Telkom - Poor adsl

We have app**** over two years ago for a fibre internet connection. Absolutely nothing has happened since and we are therefore not interested in the connection anymore. Other service providers much cheaper, nearly half the price. Furthermore, I would like to make an agreement with Telkom to pay for the quality or rather lack of it of service on my current adsl line. No data, no payment. The inconsistency of this line is shocking. I have to pay n fixed monthly fee for pathetic data supply on basically a weekly basis. I am tired of listening to excuses. I am paying for a service and not reasons why line doesn't perform.