Accidently bought wrong item from vendor
It seems their official stance is they won’t remedy any kind of user error, you will most likely get a forum mod post that will tell you the same soon.
Community Coordinator
Hello Raenen.
I am afraid there is not much we can do in this respect since this problem, although unfortunate, was not created by any error or internal bug of the game. Some players are suggesting in the Suggestion subforum the implementation of a confirmation pop-up.
We proceed to close the thread now.
Thank you for your understanding.