Ebay will never favor sellers and it is not a very fair site to sell on.
Buyers can and so (I know) claim an item is not as advertised. If you offer full refund including return shipping and they say no and continue their claim to ebay they DO AND WILL get to keep the item and receive a full refund from ebay.
Ebay will tell the seller that the buyer is returning the item but that is an out right lie.
If you appeal ebay will do absolutely nothing.
This happened to me again last week and no response from ebay after reporting the buyer and trying to appeal his claim.
Ebay is not bad most of the time but is not seller friendly so BEWARE.