Well even though I dont fly AA, I have few friends that work for AA, so if get mistreated at the gate and you go home and open up ur email and poof there are emails telling you have been EUA, Darn right you have cause. I would copy the screen and send it to AA. If it happened to you how many more people will it happen to? Have the EUA notifcation sent to your cell phone! That is if it has email.. which a lot of them do today
I would like to see them send you 2 non restrictive upgrades on your next flight of your choosing!
Shame on AA for pulling this.
NOW
At the gate they said yes u were upgraded and there was an error, blah blah blah fine but they didnt they basically lied to you and forced the lies down your throat!