I understand why you are annoyed, but Ebay tell buyers they CAN return items, even to a seller with no returns if they feel the item is not as described.

Can I return items purchased with Authenticity Guarantee?

Buyers can return an item if the seller accepts returns, as stated in the listing, and the return takes place within the seller’s return window. In the unlikely event that the buyer receives an item that is not consistent with the listing, the item will be eligible for a return. In order for a refund to be processed, all returns must be sent to our authentication team for verification (to check that the item is still in the same condition and has all relevant accessories, or that the item is not consistent with the listing) and re-authentication before the item is returned to the seller.

How does the return process work?

If returns are offered on the listing of the item you purchased or the item isn’t as described, the item will first be sent to our authentication team. Within two business days of receiving the item, the authenticator will verify the authenticity and condition of the returned item to confirm that it matches the item originally sent to you, including any original packaging or accessories (for clarity, this includes the item’s box where applicable). In addition, the eBay Authenticity Guarantee tag must be attached to the item and untampered with to be eligible for a return. Once verified by the authenticator, it will be posted to the seller and a refund will be processed. The seller’s return policy determines whether you or the seller pays for postage costs back to the authenticator.