No need. If you paid with a credit card you're in luck - there's no need to put up with the run-around from these crooked airlines and the dreadful back-office at expedia.

Just make a chargeback on your credit-card. Either call them or in many cases you can do it online now. The credit-card company will ask if you have tried to solve this with the merchant without success, and the answer is obviously yes. You'll get an immediate credit on your statement and then its the merchant who will have to jump through hoops and ultimately cop a well-deserved surcharge while you get your money back in full - including any exchange-rate losses and booking-fees which the airlines would never have refunded.