You likely won’t be able to get this worked out. See Zelle warning if you’re not in the USA.
If you like, you can reach out to your counterparty directly (via text/phone/email) and let them know what’s going on. If the two of you find a way to settle on your own, then there is no need for the trade to go to arbitration. Or you can let the trade window expire, go to arbitration and explain the situation there, where your arbitrator will work with you and your counterparty to come to a resolution (including possibly cancelling the trade).