I figured it was something you had to use a promo code for. So when I deposited I left the promo code box empty. Either way. If you did return my mbtc I would have to wager 40x that in order to be able to withdraw which is almost impossible.
You might just be able to get there. All you have to do is, go all in on the first bet. If you win then you get 30 mbtc extra, now just keep betting 30 mbtc( 15mbtc on red and 15 mbtc on black) in roullete. You will need to lose twice in those 44 rolls, to lose it all. If you get through it lucky, then you can easily withdraw.
Might work, but 45x is still way too much wager requirement.