Travel Troubleshooter: Expedia said it would refund my tickets four years ago. Help!

DEAR TRAVEL TROUBLESHOOTER: I need help getting a refund from Expedia. I booked two round-trip Air Transat tickets from Toronto to Paris through Expedia back in 2020. I had to cancel the flights, and under the refund rules during the pandemic, Expedia said I could get my money back. Expedia said it would process the refund in a matter of weeks.

I waited a few months, but the refund never showed up on my credit card. I contacted Expedia in early 2022...