Yes it's obviously a small 9 and the seller is wrong. Now it's up to you to contact him and tell him nicely. I've done it dozens of times. You can refer him to this website so he can check, or better still, include the photo above with the message. Since there are more than 24 hours left in the auction, he can change it. If he doesn't, report it to ebay; there's a "report item" button at the top of the description section.