AC only provides actual PE service on a few routes between US and Canada. What was the "City in the US"? We're you actually booked in PE on the NA segment?
In terms of your questions, they may provide a refund (although doubtful), but it would be prorated and therefore an extremely small amount. You might get better value with a comp voucher and/or discount code.
Edit to add - I assumed that you were rebooked in Y to YYZ, and still picked up your PE flight. If so, my first question may not be relevant.
Last edited by ChrisA330; Aug 16, 2021 at 8:41 am