Stupid problem
While I’m no official response, there have been numerous posts about this issue and the answer is always the same — at this time there’s no sellback functionality or way to get the item exchanged. Suppose you could open a ticket through customer support but I don’t believe it’ll go far. Sorry brosef.
Darkwing [hug], Charr Thief | Charred [hug] – Charr Elementalist | Crystal Desert
Content Designer
Currently there is no way to sell back stuff that you buy from an NPC. We’re looking into alternatives, but there are much higher priorities on our list right now. Sorry mate.