I don't know what to do to get the money out, as Duelbits are obviously not planning on withdrawing and are refusing to explain why. I've reached out on both casino guru and trustpilot, to which duelbits have just responded that they are processing the complaint, but to no result.
When they say that they are processing the withdrawal they really meant it, I'm not saying that there is nothing to worry but you have to do what you have to do when posting an accusation here in Bitcointalk, post and bring out all the available proofs and whatever screenshot you have, and call out Duelbits, acroman08 already sent a PM we'll wait for the reply and hopefully, it will be resolved as soon as possible like the one with $500k issue that is already resolved but the complainant did not show up here to lock the thread and change the title to resolve.
I hope you are different if ever the case is resolved in your favor you will do the right thing.