OFTEL - if i understand it correctly are a regulator which means they check Joe Public doesn't get ripped off too much and there is no unfair competition. OFTEL have no powers of enforcement though...
From their own FAQ click here
Q Can Oftel help with my compensation claim?
A Oftel has no powers to resolve claims for compensation
Q Does Oftel price cap cable company call charges?
A Oftel has no direct control over the prices cable companies set for their services. Whilst we must ensure that the companies do not breach the conditions in their operating licences there are no conditions controlling prices in the licences issued to any of the cable companies. In fact, BT is the only company providing telephony that has a price control imposed on it by Oftel. This is because of its former monopoly status and dominant market share position.
Q I am experiencing a delay in having my service provided - can Oftel help?
A As with all complaints involving telecommunications services, you should approach your telephone company first. You should also ensure that you been through all the complaints processes at your telephone company.
You can contact Oftel, but please note we have no powers to require any telephone company to install your service on a particular day. We log all complaints we receive and where complaint trends are evident we will bring these trends to the attention of the company concerned.