Why don't go with all of this to a lawyer ? I mean we're talking about over 150,000$  . Surely you can find a decent lawyer to represent you . If they're claiming you continued to spin on that slot , then a legal action from you will force the slot manufacturer to release the game records for your session . And like this you can easily prove it.
I'm not trying to say that they did or did not scam you , but it's also a possibility that they might be right , and you did continue playing .