Did you sell it for 730 thousand euros? 😵

Please, I need to resolve that a user wants to scam me by marking the order as paid. I have already filed a complaint, but the person does not want to cancel the order since they marked it as paid, and I have sent them the screenshot several times. They said they wouldn't deposit because they were busy. So I tell them to cancel the order so I can make my sale to another user, and they refuse to do it.