New line installed - barely useable

Absolutely **** service - had a telephone line and ADSL installed last week Wednesday 4th of February (it was scheduled for Tuesday, but after waiting at home for the whole day as requested, no one bothered to pitch up). Since installation I have spent more time waiting on the phone to the call centre than I have using the 'ADSL' that is being paid for - dial up 10 years ago was faster than my current line speed and far more reliable. On a good day, speed tests show download speeds of 100kb/s, on a bad day (by far the majority) the test pages wont even load. I have logged a fault (last Friday) and absolutely nothing has been done to fix the line.