Supporting what others said about searching and googling those betting sites that you are not comfortable gambling with.
It's easy as 1,2,3 and you have to take few minutes of typing the "casino name"+ scam/review on the search engine and you'll get thousands of results but the closest ones will be on the top of that search.
do you believe the rating/review sites or they are mainly paid like the ICO review sites ?
I'm still believing those review sites as long as I also know the website they are reviewing but if I'm not familiar with it, still do your own review for that website.
ila you send a question to the support team website and no answer for days, do not continue your work there, could be when you do not get payment and contact support team they will not care about your problem right?