User Moparofficial not responding..

Let's recap.. Guy list part. Guy responds to part, Guy pays for part.. Seller delays shipping. Buyer realizes part isn't right for him while seller still has money and part in his possession.. Seller stops responding, but we should believe it's buyers' fault for improper research.. Now if said part was in buyers hand, buyer could resell or kick rocks... But buyer is out of part cost, and without part. And seller blames it on Father's day weekend and unreasonable buyer. What are we missing here?