I would bring it up to Steve Goldman on the Yamner thread. he recently made a post describing how one petitions for a correction, and might be abble to reference it to you quicker than I.
First however, I would offer one thought: its probably just a screw up, a combination of human and eletromechanical error. I would be very calm, very self assured, and keep asking to see each person's supervisor if you don't get satisfaction. Work your way up to the person who can make you whole, but do it in a professional manner.
If they realize you recognize the error, and are willing to go through the channels patiently, they will most likely respond to that. If you go angry or accusatory, they are more likely to find excuses, or tell you there is no recourse or blow you off.
I seriously doubt there was some conscious plot to switch your order. There are inefficiencies, human error, system discrepancies, etc. that could all have been at fault. To assume they did it on purpose probably isn't a fair assumption to make - especially when you are angry. Besides, whoever answers the phone is a customer support person, not the one who executed the order.
ls |