This is a member to member board, so no one fro ebay here.
When did you purchase the item? You only get 30 days' protection from ebay so it sounds like you are probably out of time there.
If you paid with Paypal you have 180 days to open an Item not Received case there.
Otherwise you should see your payment provider.
If the seller has disappeared it will be because ebay has removed them for some reason.
It's always best to act sooner rather than later in these circumstances.
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