Always fight cases against you. Shady buyers are hoping you will just refund and tell them to not bother returning the item. Nearly every "not as described" and "item not received" case I see ends the same way: I tell them to return it for a refund, and they never send it back, loosing the case.
Have to agree with you there, has happened a couple of times now, but I did have one a**hole that filed a claim and had not even contacted me about any problem beforehand. Their attitude changes some when they have to pay the shipping back. Straightened it out with him but I would still like to file a complaint against him, couldn't figure out how to do that. All their Q & A's don't answer that question. That buyer needs to be reported.