FaceTime is banned on phones that originate form the Middle East, so any phone purchased in a Middle Eastern country, including Dubai will not have FaceTime on it - your Governments ban it.
Unfortunately, even if you move to another country where FaceTime is not banned, you will never be able to get FaceTime on that phone.
So to answer your question - there is no way to get FaceTime asap on your phone ever.
If you want to use FaceTime on your phone, then you will have to buy a new phone from a country that does not ban FaceTime, so if you have now moved to Canada, then I would suggest that you sell the phone that you purchased in Dubai to fund the purchase of a new Canadian iPhone.