Support going in circles

Hi, i have had problems with my adsl line synching at half speed, tried using a different router/cables nothing helped. Contacted telkom support (10210) and they tried re-creating/resetting the ports, didn't help. I have been told that a technician will be sent but no-one came and the fault was closed without being resolved so I had to log another support call for the same issue (***). Now the telkom support is sending me emails of things to try which I have already told them I have tried.