Slow ADSL Speed

I have 4mb adsl line. The line syncs correctly however a speed test indicates that the line is under 1mb. I have had this problem since the beginning of December. It is almost 2 months later still no resolve.<br> Here are the ref numbers of the calls logged since beginning of Dec : 43CRK171215,318CRK201215,1277CRK211215,240CRK221215,28CRK180116,17CRK190116,1282CRK210116. Here are the escalations for some of the calls : 808219,809181,809181 . I have also asked 3 times to speak to supervisors and as yet no supervisor has called. Could somebody please help resolve this issue.