Alejo, usuario registrado

Claims to be upgradation

They say that i've won .5 bitcoin, all i have to do is register on the site and enter the code. I did that, my balance now shows .5 bitcoin. however, when i try to withdraw this bitcoin, they say that i need to deposit them $911 USD to make the withdraw. that's way too much. it should be more like 50 cents or something.