I hate to be blunt here but your question is the perfect reason to avoid online gambling 100 percent.   Since you did not go to a licensed brick and mortar casino either in Nevada or Atlantic City, you did not get the benefit of gaming in a licensed casino that is subject to the state gaming laws.   Instead you hooked in with a dubious company that is probably located overseas and out of reach of U.S. gaming laws.   I am sorry to see you get taken, but that is exactly why online gaming is a bad idea.

I guess you can keep complaining to this company and maybe they will back down.   But they don't have to.  You are not likely to travel to where this company is located and sue them in that country's court system.  So, I am afraid you are out of luck.   

Next time, travel to Las Vegas or Reno or Atlantic City and enjoy the pleasure of gaming in a licensed casino that is honest and accountable.