Because Bittorrent is nothing to do with NTL cable Internet and as such has no place being discussed or supported in an NTL support area
If you are getting consistantly low speeds through over direct downloads (ie downloading patches or software from Microsoft etc) then feel free to ask NTL to look into your connection issue. If however it is just a speed issue through bittorrent then I doubt if they will rush to replace a piece of equipment that is working properly from normal download sites.