what is the name of this song?!

[-kaffryn-]

i cant remember any other words apart from the last few lines that say 'sit back and enjoy the show... we want our money back'
it is always on bbc radio1, sang by a female, quite acoustic sounding?
i think it might be on an advert too.. ive tried looking on youtube and on google but wasnt sure what to type lol.
thanks in advance :)

[factor-fiction]

http://www.metrolyrics.com/go-girl-lyrics-ciar a.html

[-kaffryn-]

not it :(

thanks anyway

[-kaffryn-]

got it

https://www.youtube.com/watch?v=EC76b0VZQog