Telkom is not provisioning my line correclty

Fault number 1440CRK221215, 368CRK241215... For the past few days my ADSL speed has dropped almost by half. I had been getting 3.5Mbps consistently for 18 months, but now i am getting 2.1 Mbps. When I logged a call (1440CRK221215) it was closed without anything being done. That lazy technician needs to be sternly dealt with. When I check on my modem admin interface, the ADSL status shows that my downstream is syncing at 2.5Mbps, but it's been showing as 4Mbps in the past, so they are deliberately provisioning me for lower speed. I have recommended so many people to Telkom for the SmartHome package I am on, which is super value for money, but with this type of service, I would feel terrible to recommend anyone else. I am really irritated that Telkom deliberately provisions me for a lower speed, and charges me the full price... That's plain *******. This is not a case of expecting the full speed, cos I have been getting consistent speeds of 3.5 Mbps up til now when the downstream was showing as syncing at 4Mbps, and i was happy with that until now. Telkom, sort this mess out... I am ready to forgive and forget if you can win back my trust.