Assuming you gamble on a mid to high-rated gambling website and you won big but they refuse to pay up, what and what are the legal way to make sure that the platform pays up your money?
It happened to many users; the easiest way is to open the ANN of that particular site in this forum and post your complaint.
It is usually observed that site owners followups on such platforms and resolve the complaint. But for the safer side, please don't use the sitwhoseich reviews that aren't good by its existing users.