Here is the eBay policy that covers this:
http://pages.ebay.com/help/policies/money-back-guarantee.htmlWhen an item doesn't match the listing description
If a buyer receives an item that doesn't match the listing description, the buyer needs to request a return from My eBay. The seller should address the buyer's concern and offer a solution, such as accepting a return, offering a replacement or refund.
If the buyer doesn't receive a response or solution, or returns the item but doesn't receive a refund or replacement from the seller, the buyer can ask us to step in and help.
If asked to step in and help, we review the item description and any other information about the item that the buyer and seller provide. If we can't determine that the item matches the listing description, if the seller has already offered a return, or the seller's stated return window and policy applies, we may ask the buyer to return the item to the seller.
When an item is returned to the seller
The buyer must return the item in the same condition in which it was received.
The seller is required to accept the return at the same location specified in the listing.
The cost of return shipping is the seller's responsibility. For return of items with a total cost of $750 or more, we require signature confirmation.
The seller pays for any customs charges on the returned item.
Either we generate a return shipping label or the seller can provide a label. We add the cost of an eBay-generated label to the seller's monthly eBay invoice.
When a return shipping label is made available to the buyer and/or the buyer chooses to purchase a separate label, the buyer won't be refunded by eBay for the cost of the label.
After confirming that the item was returned to the seller, we refund the full cost of the item and original shipping via PayPal. We require the seller to reimburse us for the amount. When the buyer arranges shipping or picks up the item, we may not refund the cost of original shipping or pickup.