Degraded ADSL line speed

The was an outage in my home town, Modimolle and I I was without telephone services (telephone and ADSL internet) for three days. I am on a 2 mbps ADSL uncapped line and normally www.speedtest.net measured my line speed at 1,8 mbps. After the outage was restored my line speed was only 0 to 1,3 mbps. I opened an error log to solve the problem, but Telkom closed the log and the Call Centre told me that a speed of 0,9 to 1,8 mbps is totally acceptable on my line. In no uncertain language (no swearing) I told them that it is totally unacceptable for to operate now on about half the speed I had. They just ignored me.