Join Date: Nov 2000
Location: Nashville -Past DL Plat, FO, WN-CP, various hotel programs
Programs: DL-MM, AA, SW w/companion,HiltonDiamond, Hyatt PLat, IHF Plat, Miles and Points Seeker
Posts: 11,405
You did not stick to your originally purchased ticket. YOU changed it and therefore the fee is legal.
With that said, I think it is just plain WRONG for them to charge you.
I am going to guess they will have an entire group going through all the credit card chargebacks for a few months as this will happen often.