As stated in the subject line, I exchanged unwanted items with the Convergence Cipher and would like those items returned, along with a rollback of the Glimmer, Exotic Engram, and Ascendant Shards.
I'll explain how this happened below.
1. I logged into Destiny 2, transmatted through a portal to the Tower, and then met with Xur.
2. I exchanged a previously accepted Xenology reward, later used a Strange Medal to purchase an Ascendant Shard, an Exotic Engram, and an Strange Gift, and later exchanged it for The Nine's Favor.
3. I went to the Cryptarch and opened the Convergence Cipher.
4. When trying to send the page to exchange for the "Sixth Coyote" I'd been wanting for a while, I accidentally clicked on "Liar's Handshake," and since there was no need to hold down the button, the exchange went through.
That's what happened.
(This text was translated using Google Translate and may be imperfect.)
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Bungie won't do a rollback or trade the items. You will need to obtain another cipher/exotic engram etc and then go and obtain the correct item.