Trade Phone Sent to Wrong Place

I received a new phone that required me to return the old phone for a credit. I shipped my old phone in the box the new phone came in using the label inside the box. The shipping label in the box was actually to return the new phone, not the trade phone. Now, my trade phone has gone to the wrong place. How do we rectify that situation and get the phone to the proper location so that I do not lose the trade credit due to this confusing process. It seems like this happens a lot, there has to be a better way to help people do the correct process. It would help ATT, as well, as there wouldn't be so many issues to correct relating to trade ins. Please help. I have been on hold/music all morning trying to talk with someone.