Originally Posted by
Antarius
Call back. Explain that you were ticketed in business class and then due to schedule change your original flight was no longer possible and you were rebooked. You would like to be placed in XYZ flight in business class.
Avoid the system-wide avoid the discussion about lost upgrades etc. You are in business class your flight was changed, you need to be rebooked at business class. That's it.
I wish it were that easy, but it takes them about 10 minutes to see the original flight was booked in main cabin and upgraded to business via a systemwide upgrade. I started that route and they led me down a rabbit hole of around 10 hours in conversations across three days only for a supervisor to conclude there is nothing they can do because the systemwide upgrades are gone so they can't reupgrade me and they can't get them back.
They also told me that there are no business class seats on the flight I'm now on. I offered to be rebooked through any US city in a 4 day window of departure and still told there is nothing.