Emaill [email protected] with the details, including boarding passes (if you have them) plus original booking invoice/ticket. Then follow up with them after a month.

I had a similar issue last December with a re-route due to IRROPs. Simply entering the details into the Aeroplan website produced an email a day or so later that the operating carrier had no record of my flight.

I posted a thread about my experiences here:Trying to claim missing mileage without boarding pass - am I SOL?