Hello Fidney and
to the forums.
I can see you have had a raw deal with all this I should go to the top now you have been trying the correct method for too long now its time to get a response.
I know from helping others on our forums that BT's CEO gets involved and sorts out problems by making those he gives the jobs to sort it having to reply to him whats happening until its sorted perhaps a lesson there for NTLs directors.
Look at this list and contact the area Managering Director but please even though you have had a raw deal please be polite and you should get a response if you don't then you can rant on at him
(jk) just come back here and we will see if there is another route to take to get the service you are paying for.
Look
here for the managering director for your area.
Good luck