hi, i deposited £200 on prospect hall casino and took there bonuses, ive been playing for a while now and trying to meet the wagering, i was down to £350 to wager with about £350 in my account, i went on to roulette and won £180, i then checked my wagering amount left and it had increased to £514, so basicly i cant withdraw anything that i win, are casinos allowed to do this?