I had booked a trip in Oct 2021. I spent weeks trying to get a hold of an agent to change my flight due to a medical emergency without success. Even American Express could not reach the Airline, they subsequently credited my account after. Lengthy disputed investigation. Over a year later, I received a notice that a collection agency opened account for an amount of $900. I never once received a bill or notification from Air Canada or the collection agency that I owed anything for a service I did not receive. Absolutely pathetic service. The Federal Trade Commission has been made aware of the poor service by Air Canada, Cedars Businesses and TransUnion Credit agency.