ADSL line still not working properly

I am supposed to have a 4mb/s ADSL line, but for the last few months I mostly get 2mb/s if I am lucky. I keep on reporting the problem but it never gets repaired. Some person always phones me and says that they have repaired the line, I tell them that it is still not working and they say that they will have a look and then I get an sms saying that the service has been restored. IT HAS NOT BEEN RESTORED. I pay for 4mb/s but I do not get the speed I pay for. I REALLY THINK TELKOM'S SERVICE IS PAST PATHETIC!!!<br> I always get promised that it will be sorted out, but I don't think there is anybody at Telkom that still cares about Customer Service.