I think if you think you have a legitimate claim against this site then post it in the scam accusation section. OP offered you a 1btc bounty to prove your claim. Take him up on the offer or move on.

What you have posted can be photoshopped so its not real proof to me. Feels like an extortion attempt. If he wanted to screw you hed have screwed you on all your bets right? Looks like you or someone was paid .1 and .08 according to a post prior to this 1.