I won an auction on eBay that closed on 10th March. I paid the full amount, including postage on the 10th. The auction was for a NEW Veritas Router plane, large, a fence, 2 blades and a plane sock. The vendor now states he can’t find the fence. He wants me to accept a refund of $10 USD, which is the difference between Lee Valley’s cost of the large Router plane and their cost of a combined purchase of the router and fence. For me to separately purchase the fence it costs $23 which he has refused to pay. He is threatening to cancel the auction. My question is: am I being unreasonable asking for $23 not the $10? It will cost more than $23 for me to purchase it as I will have to pay shipping on the fence separate to the router. What do you think? What do you advise?