what does ebay when a buyer complains the product wasn't properly described and returns it and it hasn't even been opened.

See here: http://pages.ebay.com/help/policies/buyer-protection.html#conditions1

From above link:

"A good faith dispute does not exist if you improperly claim that the seller has not fulfilled the transaction, if you claim you never received an item when in fact you did, if you refuse to accept shipment of the item (and eBay didn't end the listing), or if you claim the item was not as described but the seller can prove otherwise.

Moreover, a good faith dispute does not include buyer's remorse (that is, the item delivered was as described in the item description, but you no longer want the item regardless of the reason). However, even in a case of buyer's remorse the buyer may open a case and eBay may refund the buyer and receive reimbursement from the seller if at any point after the sale is completed, the seller agrees in writing through eBay Messages to provide a refund upon receiving a return from the buyer. Once the buyer returns the item using appropriate tracking, the buyer may open a case and eBay may refund the buyer and seek reimbursement from the seller. However, if a buyer returns an item without agreement from the seller through eBay Messages, we will not cover the buyer's case for the return and will not hold the seller accountable (even if the seller's original eBay listing stated a return policy).

You have not initiated another form of resolution processing, including credit card chargebacks (if you paid by credit card) or PayPal Buyer Protection claims (if you paid by PayPal)."

Sorry that is all I could find and I don't know if it will help you. I would try reporting them to eBay and see what they say.

Good Luck.