Still no service

It is now 2 weeks since my line went down, although the land line has been restored and appears to be working normally, the ADSL line is still extremely slow. After logging numerous faults with the call centre and receiving numerous sms's stating that the service has been restored, the problem still exists. My ISP has also logged a fault yet nothing has been done. Unless the annual awards for most pathetic service provider are on the horizon, I see no reason why the service cannot be restored and again why technicians do not verify with the customer before stating that the service has been restored. Growing ever more frustrated with the situation. Surely there must be an ombudsman to deal with this situation. If so please provide the contact details.