The problem with your case is Rollbit doesn’t intentionally do maintenance to cause your losses that’s why it can’t be categorized as scam attempt that deserves to be -ve trust by DT.
Although Rollbit can show a good gesture to refund the damage since you are really affected however it’s not a must. You should use exchange rather than a casino on doing high leverage trading if you want a hassle free experience.
If there’s a lot affected with maintenance then you can file a strong case against them.
$45k is no small amount of money to lose in a trade at once, and while it's perfectly understood that Rollbit did not go into maintainance as a way to make op loose his money, (I assume something urgent came up which they needed to fix immediately) but according to op, if all he said it true anyway, that maintainance ruined his chances of mitigating his loses when the price of bitcoin kept declining.
The best the casino would have done is investigate the case properly and see how they can compensate op for his loss, not use result of his past trades against him, a person who lost past trades does not mean he can never win one, and if he was going to win this thread, or maybe save it from draining as much money as it did, the maintainance ruined that chance, and it's the fault of the platform that went into maintainance without a proper announcement as op claimed.