I likely wouldn't get involved with this at all. You sent the coins to the wrong address, tough shit! If it's a different network doesn't really matter because if you aren't attentive enough to double check before pressing confirm then it might as well have been the wrong btc address at which point you'd likely complain too, no?

The way you have handled this whole situation looks bad to me, never giving Rollbit the benefit of the doubt and making up your mind beforehand.

For the future, when you go to a new casino, double - even triple check whenever you withdraw. Goes for any transaction at any time and for any amount, too. It's so easy to avoid issues if you don't speedrun life!