I think I was confused when booking the tickets since I did not look up the anything and just searched on delta.com for first/business instead of economy and booked the flights. Everything looked fine until I finished the flights and looked at the account history and it showed "U/A". If I had known there was not 150% MQM then I would have probably just flown economy that cost much less when I checked at time of booking. I was surprised it said U/A because I thought a U-class was Coach only. The two other passengers on my itinerary have no medallion status but I guess they are considered companion medallion since I am gold. The flight was YYZ-ATL-HNL-ATL-YYZ all A seating.

Do you think this is worth pursuing with Delta?

Thanks.