Formerly known as CollegeFlyer
Join Date: Jan 2004
Location: JRA
Programs: UA 1K MM, AA PLT, Hyatt Diamond, Marriott Gold, Hertz 5*
Posts: 6,716
If everything is truly as stated in the OP, I would dispute the $550 charge with the CC company, explaining that you paid $550 to switch to an earlier flight, and that the airline did not provide the service you paid for, as they cancelled the earlier flight after taking your money and put you back on your original flight.
Your original fare required the airline to get you to your destination, which they did, so that is not at issue.
The additional $550 (change fee and fare differential) was paid in exchange for the airline putting you on an earlier flight--which they did not do.
Just my 2c.