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.
Maybe you lost the bet?
@OP can be. If you have all details A-Z with TX and provable address ownership then I see no reason why they wouldn't return your 0.4 BTC (if it was accounted for in their system it would come up as unsettled).