Sometimes asking it to google helps a lot my friend, i just find this link:
https://www.interpol.int/Contacts/Contact-INTERPOLI'm not sure if they can take action over scam casinos, but at least you can try it, i mean, it's free to do it.
It would be nice if you can mention the scam site, that way other users who read your post would be able to avoid the site.
Dude, you didn't read my post or the first lines on the website you just linked:
Criminal activity should be reported to your local or national police. INTERPOL does not carry out investigations or arrest people; this is the responsibility of national police.
You can't report crimes to INTERPOL. That is only for national police forces that are cooperating with one another in order to collaborate on catching wanted criminals.