Help me I took the same dagger for points

Greetings. How do I return or can I return a dagger that I have over points....I took the same one as last time and now I can't set it as a weapon? I didn't know that I can't take two of the same dagger. character Unalena roque. Thank you
Purchased item Fang of Oblivion for 17.0 points 9 hours ago , Purchased item Fang of Oblivion for 17.0 points 3 weeks ago

If it says "Unique" or "Unique-Equipped" just below the item name in the tooltip, then yes,
you can't have more than one of the same item in your bag / equip more than one of the same item on your character respectively. And no, items purchased with points are not eligible for support/refund.