I made a booking with avios for an AA flight. I didn't write down the PNR at the time of booking. I called AA to get the AA pnr but now I need the BA/amadeus pnr so I can cancel the flight. The booking doesn't show under my bookings on the site. I am currently on hold with BA but the wait time is over 30 minutes and the flight leaves in exactly 30 minutes.

How can I get the BA pnr ASAP?