I had the same problem - subscribed on Friday to watch the Liverpool game on the Saturday. Minutes before kick-off the signal encrypts - WTF!! So I try to ring them and got rudely cut-off every time I selected the "I am a current subscriber" option (I tried all the other options as well!) - could not get through to an intelligent lifeform at all, despite many attempts. I can't believe they were *so* busy for several hours on a Saturday night.
So I decided to send them an email saying how disappointed I was etc. and that I will probably consider cancelling now because I didn't get to see the game I wanted to watch.
The signal actually came on about 10 mins from the end of the game and it's been ok since, but they certainly haven't given me a good impression of their business, and they never bothered to reply to my email. I guess it must have been a shock to them that people actually wanted to subscribe for the Premiership games ???
All in all, 2 out of 10 so far.