[Nextgrid]

Do you have the money from this sale in your account? If so tell them to pound sand and let eBay hold the bag. Legally the sale seems to be completed fine (you've stated upfront that no returns are accepted and the reason for "not matching description" is clearly bullshit) so I wouldn't worry about it. If they try to collect the money later you refuse and keep telling them the same story and provide the same evidence, which by that time will be routed to someone with at least half a brain that will clearly see the lies of the buyer and not fall for it.