I'm flying to JFK on the 23, and returning on the 28 booked in PE (upgrade award). I had reserved myself 31C for both flights way back when the booking was made. I checked this morning under manage my booking, and to my horror I have been moved!! I quickly called the club hotline, however the nice lady was unable to assign me to 31 A/C again because they are occupied. (She really did try her best because she was gone for 20 mins)

I'm not impressed because I have never been informed or communicated about the seat change. Also I had the seat reserved way back in time. Sure I'm probably not the most profitable DM out there, but I am quite frustrated by this. Seat assignment is a published benefit last time I check. So how on earth did this happen? A more profitable DM demanded the seat and then CX decided to casually move me?

What do you guys think? tough luck? or should I complain?