I can so relate to your frustration. Yes for me it was a year ago, so I cancelled my contract asap. I didn't get my installation money back but the rest of the payments I made to Sky has been refunded in fact if I remember correctly they charged me for the days I had SKY till the cancellation despite it wasn't working fully. I wanted to get Virgin but at the time fibreoptic hadn't reach to this area so it wasn't possible. In the end I got BTvision and it was very easy to install and very good in many ways. Like Virgin it's got lots of programmes on demand as well as films. With an extra cost you can get SKY sport and ESPN. So if you're still in your 14 day cancellation period I recomend you to consider it.
I hope it helps.