Than send that to support, if you've done nothing wrong like having insight in the secret seed or such they will pay you out. Hope it's sorted out soon for you.

And btw they can see all your tips to other accounts and if you used a VPN also tell them, many users use it and double IP's are common then.

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I do use a VPN but I didn't use any tips or have insight in a secret seed. Do they do this to everyone who wins a few grand? Although my cashout was large my profit is only ~4 bitcoins.