Ebay wrongly refund a buyer

I sold a vintage motorbike horn to a buyer in France, I am in Australia, it was sent by sea mail, Australia post stipulate it takes 12 weeks for it to post to arrive from Australia to France by sea. The buyer opened a dispute  (non received item 7 weeks after purchase,) i supplied the customs declaration number , plus a copy of postage receipt. EBay decide in favour of buyer went into my account and refunded to him cost of article, plus postage. Thanks to eBay I effectively gifted him the item, plus paid the postage to do so. I contacted eBay disputing the action, they will not answer