Sevenfold bet on eight sporting events, how does it work?

I put a sevenfold bet on eight events, i meant to do an accumulator. It has 7 football matches and the haye klitschko fight and basically i am not sure how a sevenfold works. 6 games have won, one has lost and the fight is at the weekend but on Williamhill it still says the bet is open even though a game has lost. can somebody please explain how a sevenfold works. And what will happen to my returns if i win my bet on the fight. Thanks