Travel Troubleshooter: Road Scholar downgrades traveler from business to economy

DEAR TRAVEL TROUBLESHOOTER: I just completed a Road Scholar trip to Egypt, but on the trip home, British Airways canceled my flight four hours before its scheduled departure. My ticket was in business class, but British Airways rebooked me on Egyptair in a leftover seat at the back of the plane in economy class. The ticket cost British Airways $416.

I spent $3,000 on business-class airfare. I’d like to get a refund for the fare difference.