Why do you always say you don't want to share all the evidence you have and why did you say in OP that you don't want to file a police report! Am asking because this makes you look like you are hiding something and you are afraid of exposing it (usually because you realize it will make you a culprit).
If you think the casino owners/representatives have wronged you then share all the evidence you have.
With all the screenshot that the OP shared especially the letter made by their CTO i guess i obviously say the the OP is the victim here.
Although i would advice to share all screenshots the OP made, from platform/in-app chats, platform transactions. Also, i would suggest you to file a police report for them to alarm and make you prioritize. Filing a report doesn't mean you're defaming them or what, it's your right after having a bad experience for days and obviously feel like you scammed.