Spin and win

I joined this site today put£50 on and got a matched £50 played for about an hour and was up to £700 went to withdraw and it said remove the £50 bonus remaining balance £650 so clicked confirm and it's took the lot, contacted em and they said its my own fault and won't put it back on, is there anything thing I can do/contact? It turns out I had played through 73% of the wagering requirement and only had £731 to play through before could withdraw