We need to listen to what rocketpot has to say but considering this is the same place that has given out so much money so far, I doubt that they would be out there trying to steal 1 bitcoin from some gambler.
I am sure if you could provide with more proof than just saying you were scammed by the casino, you would be taken a lot more seriously. So far you have just said that you deposited 0.001 bitcoin and turned it into 1 bitcoin and couldn't withdraw and your account was deleted, that's all you said and that was given to us by text from you.
I think the best way to go from here would be you providing us with proof that this happened, otherwise I can claim the same thing, who says you are honest or not, so a proof would be a lot better. Secondly after you provide us with proof (considering you can) rocketpot would have to defend their decision as well.