If such situation happens to you, how would you react? What a person even can do in this situation? Go away with chips? Give chips to someone else and let him cash out? Contact lawyer?
I think this guy did it right... Before you do anything else, turn on the camera & start recording. I don't know how many people have a lawyer in their contacts, so I would probably start with the supervisor who said no. The next step is some inspection, I am sure it's easy to find some numbers on the internet...
Well, when something like this happens, it's very unpleasant & can ruin a good mood. After an experience like this, the player will never want to return to that casino...