"Every government that issues gambling licenses has some kind of AML/KYC procedure & regulation integrated in the license when amounts go over specific thresholds or there is reason to suspect fraudulent behaviour"

From their response i gathered that different device was used and from different location and you couldn't access your registered email. If i were you i'd be really happy if my casino provider refuses to pay out like this. looks like really big chance that someone just got access to my account and tries to take the money. wouldn't you agree? when when you don't agree with this i cannot see any justification for the scam accusation, at MOST it's just uncomfortable customer journey as they actually havent broke any laws or terms and conditions? if the right to kyc clients was included into terms and conditions and you accepted those terms by registering and playing?