Folks, like it or not, the seller can decide to sell to whomever they like. Once money has changed hands, they are on the hook to fulfill their obligation.
While being "first" and not getting the object you seek is annoying, under the rules you cannot leave feedback for the seller.
You are free to ignore their sales in future if you wish, and you can post in Feedback if you have a legitimate beef, but there were no conditions of sale supporting any arguments from what I see.
Let's move on. The seller will contact the buyer he has chosen to sell to.