They are active in this thread every day, so you can start making some noise there and see if it works: https://bitcointalk.org/index.php?topic=5129857.msg60730093;topicseen although I'm not sure if it's a bot posting or a real human.

There was a guy complaining about this casino a while back (https://bitcointalk.org/index.php?topic=5239937.0), but like yourself, he didn't provide any proof whatsoever to be taken seriously.