These related Help pages may answer your question:

• Does eBay offer buyer protection?
  eBay and PayPal both have Buyer Protection programs. Click the link above to learn more about these programs and the steps you can take to ensure a successful purchase. . . .
• What can I do if an item I paid for didn't arrive or wasn't as described?
  If you don't receive your item, or if your item wasn't what was described in the listing, first try to contact the seller. If you're unable to resolve the issue with the seller, click “My eBay,” at the top of most eBay pages, and sign in. Then click the "Dispute Console" link on the left side of the page. You'll find a link to “Items Not Received or Not as Described.” You can open a dispute within 10 to 60 days after the listing ends. If you prefer, you can click the link above to open a dispute and learn the next steps that you can take to resolve the dispute. We also offer phone support about this issue at: +1 (888) 445-4992, Monday-Friday, 4am PST-10pm PST.
• Can a seller refuse to sell an item if I am the winning bidder?
  No. Just like a buyer must keep the obligation of paying, the seller must keep the obligation of selling. For more information about the seller performance standards policy click the link above . . . .