If it was a business seller, find the contact details on their current items.
If there is a phone number, an alternative email, or an address, use those methods to get in touch.
You can't do anything through Ebay outside of the 30 days allowed by the Money Back Guarantee so you will have to be persistent and get in touch with the seller.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
