What kind of evidence do you need?
I try to contact live support, but they tell me it is closed, with no funds return.
how about the screenshots of all the conversations you've had with their support? also, I don't know if it will show on your betting history but if possible you should also show the transaction of the bonuses you bought while playing on their slot games.
I have the email reply from the support team, but it is not english.
Everything I described here all true, the bought bonus games are in my game history, I can provide it.