For the last 2 years, sent .4 BTC to satoshi dice betting address before they disabled it. They never returned it. I've tried contacting them many time. I will probably never see this money again.
On which site did you sent 0.4 BTC to play the dice ?
Did you play with that money ? It might be that you played and lost all. You need to provide a little more details if you need any good suggestion.