Telkom Won't Acknowledge Fault On Business ASDL Line

We pay for a business ASDL line from Telkom. Regularly the internet connection is extremely slow. But when we call up Telkom to lodge a fault, they refuse to accept that we would like to lodge a fault. This has occurred several times.

We have a fault on our business ASDL line and we would like for it to be fixed. How do we get this done, Telkom?