Continued Poor Service and Response

I have experienced poor service on my ADSL and phone line several times over the past year. Every time somebody comes through (eventually) to fix the problem I point out the nearest telephone pole, which is in severe disrepair and continues to be the source of the issue, only to be informed that it cannot be fixed until every available line on it is used. So I've now been changed on this shoddy pole around 4 times, only to have service restored for around a month at best each time. EVERY TIME I experience degradation of service until I have to start the whole process again, wait around for a callout and point out the same issue only to have the same pathetic response and result - luckily in the interim I have to keep paying the bill despite the lack of service, I guess that must help pay for the technician who is never available (why not hire another with the money I pay that isn't actually being used to get me service?) WHO DO I HAVE TO SPEAK TO IN ORDER TO GET THIS FIXED?!