As this appears to be an all-partner-metal booking, it's worth noting that no matter whether you'd originally booked it as all-business or as a mixed-cabin trip with YYZ-AUH in business and AUH-PKX in economy, the price would have been no different.

In other words, in Aeroplan's eyes you didn't pay any extra to get AUH-PKX in business.

Worst case, you write in and they tell you to get lost, but by the letter of the rules you're not *entitled* to much in this case.