This is the new money back guarantee. sellers have to pay for returns unless change of mind.

http://pages2.ebay.com.au/eBay_Money_Back_Guarantee

But then on this page under we've got your covered it just says

"You can now shop on eBay knowing that if your item doesn’t arrive, or is different to what was described, you’ll be covered for the purchase price and original postage on eligible items."

i would point this out to them.