have you tried ringing the BT Broadband helpline on 0845 600 7030 ?
I soon learned it's no go good ringing the normal BT line-fault reporting number (0800 800 150/151) if you're reporting a broadband problem. that's only for if your phone doesn't work. The phone and internet services operate as separate businesses, each with their own procedures and engineers.
based on my own experience, you should ideally have your router/modem plugged directly into the BT master-socket, not via an extension, as that only adds to the overall line-length from your exchange to your router. That's critical if you're already near the maximum distance. Plus, extensions may be poor quality or damaged (esp if under a carpet) and that would further reduce your broadband speed.
I'm on the 'borderline' distance-wise. Only recently got it sorted. had to have BT out to move the master-socket into my PC den (bedroom), and even then had to strip out all extensions going to all other rooms. I then bought a 3-handset cordless phone, with master phone in my computer den, one handset in the living-room and one in a bedroom, neither of which needs a bt socket since they are cordless.
I haven't finished yet -- speed was ok but kept losing connection. The problem? -- the useless, free router they sent me just packed up went it got too hot after 30 minutes. It's a design fault -- they're too small and build up too much heat. It was pointless asking them to replace it as they'd only send me the same type with same fault. So I bought my own router -- a bigger one which hardly gets warm and it's never off.
Eventually, I'm happy, thanks mainly to my own efforts, not BT.
Edited by pip22, 07 February 2007 - 08:34 AM.