If you do really feel that they are scamming you, you can start a scam accusation thread. Prepare your proof(s) once you are going to open the thread and you can follow the format as given in this thread. Anyway how much is the amount you tried to withdraw? Did you made a deposit before or the amount you tried to withdraw is a win from the free spins code? If it is from the free spins code, did you follow the rules especially related to the max allowed amount to withdraw?