"Thank you for choosing Air Canada"  That's as far as I let it go before hanging up.  I have NOT chosen Air Canada for anything for years.  When I called it back, i got what sounded like a recording of the Bell message, "This number is not in service".  It never disconnected like a real Bell message would after a few repetitions, followed by the busy signal.  I don't believe it is Air Canada at all and the number is spoofed.  The number showed "unavailable name" on my phone display, but a Canada411.ca search showed "no number found".