Mr. Lipring,
I really am very sorry to hear that
. Sometimes it frustrates me to hear of your type of a problem. It does make us look very bad as a company and to be honest with you, it really does hurt to know that no one has been able to sort out your issues.
I personally look at every single job I attend as my own. If I am not happy with things I see and come accross as an engineer, why should a customer be?
All I can ask you to do is try one more time with the fault team/engineers, and tell them you have been informed that it could well be a reverse path issue and could they look at that side of things. To do this is quite a simple job for a competent Network Engineer, and I feel confident that is where your trouble lies.
If you are not prepared to give it one last shot with NTL, then I can not blame you but please don't think that your case is the norm. I work with a group of guys that "ALL" take pride in working the Network in my area, and we will always go that extra yard to make sure that the customer is happy in one way or another.
Good luck, and I really do hope you manage to get things sorted out once and for all.