So I booked 2 BusinessFirst tickets from ORD to EZE through IAH on CO on a saver award 50k each for 2 tickets. Travel times changed, but not a big deal, but now arrives at the same time as UA from EWR. Since 764 is undergoing conversions, I decided to make the change to UA to ensure lay flat seats. Called CO and had them switch us. Wanted first on miles so was willing to spend the extra 17.5k miles on each tix over the 50K for BF. CO made the switch from BF to UA first, but kept the mileage charge at 50 K and did not charge me the 67.5K. The kicker is we are only booked on economy for the ORD EWR flight (not a big deal) but that flight now shows RN and RO availability. Should I call to get the first on the ORD EWR flight, wondering if they will catch that I paid the lower mileage for first on UA when I call. Would also like to experience the IFL at ORD, but not sure I could n my situation.