I'm still trying to get AC to credit 500 miles each per rental from Nov 2005 !
My Aeroplan number is on my Emerald Card profile. But in some places, like the UK, you have to give the number at time of rental. I make sure that it's on the rental agreement.
I waited for at least 3 months, and then sent it each rental agreement to Aeroplan and so far I have not seen anything credit. I call and ask Aeroplan, they have no idea, said that they never received the info. So I sent in another set - about 6 rentals between Oct and Dec 2005, and stil nada.
I've given up hope.... and now credit all National Car Rentals to other FF plans now. They usually get credited within a couple of weeks.