ADSL line still not working properly

I have previously complained about my ADSL not working properly before, but nobody at Telkom seems to care. I am supposed to he a 4meg line, but I usually only get between 1 meg and 2meg speeds. I have reported the problem on numerous occasions to Telkom, but it NEVER gets resolved. The last few times a wasn't even contacted by anybody from Telkom and when I phone to follow up, I get told that the problem was resolved. This is very bad service from a provider that advertises that they are a top telecommunications company.