Bad Service from Telkom and usual excuses.

Installed a 10Mbps uncapped dsl line from Telkom in July 2016 and it worked perfectly up until the end Jan 2016. The line started slowing down (5Mbps), so I logged a couple of calls with the very useless call center and I have now been struggling for the last month to resolve this issue, I am still paying for the 10Mbps line however I am only getting half, furthermore they will downgrade your line without informing you but still gladly except the payment for 10Mbps and now I am being told I am to far from the exchange, lovely and so the normal excuses start, well my house did not move in the last month nor did the Telkom exchange so how can I be to far if this line was working for 7 months???? When you call the call center a technician is apparently busy with the ticket, well please fire that useless guy because you can sit for a month on a ticket then we not even mentioning the tickets that just get closed without fixing the issue.