The buyer purchased some women's shirt's

So I have this scam artist who bought an item from me, used it, claimed it was too small in their neutral feedback (even though it was CLEARLY listed in the description) then lied and told me it didn't work as their reason for return.  They returned it with their pictures still loaded up on it, but it was all used and scratched up.  So now they opened a case against me.  So basically buyers now have 3 ways to bend you over; feedback, Open case, and Description DSR.  This woman has now hit all three.

I was told by eBay I could partial refund since the item wasn't defective and wasn't returned in the condition shipped...we'll see if eBay that is their position now a case is opened.

Other than keeping more people from being Top Rated...what is the benefit of allowing buyers three ways to damage your standing on eBay?

I had a similiar situation. The buyer purchased some women's shirt's, knowing the sizes as listed. One day I receive an e-mail that simply said "I received the shirts and they do not fit me." She opened a case to get a refund and refused to pay return shipping to send them back. She claimed to eBay a different story than "they didn't fit", she claimed the shirt's were fake???? OMG! So have worn "fake" shirt's, what the hell, but the buyer got their way and of course we can't alert other sellers about buyer's like this. These policies are getting ridiculous.