If you bought it on eBay, simply turn it in as an Item not as described.
They will take the money from the sellers PayPal account and open a investigation.
Even if the seller does not warranty the part eBay will still give you your money back if the seller had it listed as a "used item".
They will even make the seller pay for return shipping.
If they had it listed "for parts only, not working" then you may not get your money back.
It's worth a try.