Useless service

We have a business line and its been down since the 3rd November. I have phoned multiple times but still our line is down which means that our clients cannot phone us and we lose business. I am sure we still get billed at the end of the month and yet we also dont have ADSL because it comes from the same exchange which is broken. I have also tried numerous times to have the phone line diverted so that we can receive calls but no, that has also NOT BEEN DONE!