When you visit an American Indian casino, you are, for all intents and purposes, in another country. They can run things however they want. Generally, the people running the casinos understand that repeat business requires treating their customers well. If you feel you have a grievance, you are mostly at the mercy of the management's business judgment. Your best weapon is a coolly delivered promise to make the situation as public as possible.
Federal law does mandate that American Indian casinos be supervised by a gaming commission.
In the case of Soaring Eagle, it's the Saginaw Chippewa Gaming Commission, composed of tribal members. So, while you do get some protection, it's not quite the same level of recourse as a federal or state agency. Write him at P.O. Box 828, Detroit, MI 48231.