Good luck with this! No numbers seem able to deal with tv, the Chat Online people never answer. Apparently there are no current issues with service being down on Tv so the broadband guy I just spoke to on 03300 412 462 couldn't help me. It seems as if no-one cares when we need to contact them over a problem. But I still have a blank screen since yesterday and no connection for tv programmes.
I am assuming you are coming from the old white NowTV box ?
See if anything in my post on this similar linked thread below helps.