To begin with, let me say that I'm not usually someone who complains a lot and I don't really ask for compensations too.

My mother recently flew to ORD on a direct flight in businessfirst and due to other cancelations, a lot of people that got stranded were rebooked on to her flight resulting in overbooking. They approached her and told her that if she flew with a stop in FRA (still on United), she would be offered a ~400 USD voucher for future travel on United. She accepted but asked whether those 400 USD could be credited to her M&M account as mileage balance (whatever a reasonable rate they would offer).

They told her that she had to contact UA after the flight took place so thats what she did and now UA responded saying something in the likes of "we apologise for the inconvenience and are aware that you were unhappy with our services". They now offered a 250 USD voucher which is less than what initially was offered.

The question is, should we press them for more at this stage? It clearly states "Invol" on her new itinerary stub which I assume means Involuntary since they basically forced a lot of people on a different flight and offered compensations for it. Its needless to say that this was a work-related trip.

How come do they offer a 400 USD voucher at the airport and then go down to a 250 USD voucher when contacted by email (It also said in the Email that this offer would be an exception since usually they only offer compensations for delays of 4 hours or more).

Thanks for your insights...