You have 30 days to open a dispute on ebay so are out of time on here.
If you paid by paypal then open the Not as described there. You would have to pay any return postage.
if you paid by card then try your card provider.
If it is not in your Purchase History check your personal emails as you probably were not signed into ebay when you bought it.
_____________________
We are just ordinary members trying to help.