That’s interesting!
Did you know that most casinos would ban your account just because of this.
Casinos offer those bonuses to attract new customers. If your only intention is to take advantage of the bonuses, make some profit and then leave, sorry they won't accept that.
You need to understand that casinos do not give free money.
I won’t totally agree with that my friend, as some casinos that I have tried myself are giving some offers and bonuses, great bonuses and payed me normally after taking advantage and had earned with them. We can call it luck sometimes but it worked for me and never had any issues while using bonuses or free spins.
Op should probably provide more proofs and screenshots to support his words against the casino, if we don’t see any answer from the second part after trying to reach them out after that we can wall it a scam.