What the hell is going on here? Your post is so full of nonsense that I don't even know where to start.
A Dutch player who shouldn't be playing outside of his country? What does the country of birth have to do with this? I have been living in Germany for 17 years!
I won a large amount through activity on several accounts? Several? I only have one account.
I did not do any arbitrage. Coinplay never mentioned this either.
If KYC would be asked, I would fail?? Why? I am living in a perfectly legal country which is not forbidden in the Coinplay terms and have a driving license and utility bills from there.
It's a peculiar situation, Coinplay isn't responsive, and I haven nothing smart to say anymore.
You've already did all the steps that you could, you could eventually lawyer up and go against them and their license holder if you like, as I already mentioned a few posts before, but be 100% sure that the claim is truthful before you enter that field.