Originally Posted by
DYKWIA
Did you make the initial flight booking with a credit card?
If so, you should be able to request a charge back of the original cost. You'll probably need to provide details of the emails / phone calls, and also a copy of the amended flight booking that you got from Expedia.
Chargeback against VISA/MC for the original ticket is not an option if the charge is more than 540 days old which it sounds like it is. AMEX probably have the same limitations as well.
This rule is set by VISA/MC itself so card member bank can either choose to eat the charge themselves or not open the chargeback at all.