Guild Wars 2

So, if i was to buy two berserker’s ascended amulets because why not? where would i go to see if i could get a refund.

Option #1: Give the amulet to a different character on your account.
Option #2: Click on “Support” at the top of this webpage and submit a ticket.

If you buy 2 identical trinkets you can contact support at https://help.guildwars2.com/anonymous_requests/new and make out a ticket. They will send you the trinket with the same stats but the other infusion.