A chargeback should get you the money back and that would be the end of it. It takes 30 days or so. There’s virtually no chance they will be able to prove they

A chargeback should get you the money back and that would be the end of it. It takes 30 days or so. There’s virtually no chance they will be able to prove they provided you the service that you paid for, since the flight was cancelled. The credit card company will then side with the customer.