A marriage doesn't have to be registered to be legal. Under Indian law, a marriage conducted by a socially accepted ceremony/method is as valid as a marriage conducted before a magistrate/court marriage. Registering the marriage simply makes it easier to deal with paperwork.. but your marriage starts the day you get married in whatever way is acceptable in your community. It doesn't start the day you get it registered.
You have to talk to a lawyer in India. This will honestly come down to your resources and ability to fight him in India. If you don't have the ability to fight this case, you may want to figure out what you really want and what you can afford.
You really need to talk to a lawyer in Canada and get his/her advice, and then figure out how you can contact a lawyer in India (and whether you want to).
What are you trying to get out of this? Are you trying to protect yourself, or are you trying to go after your ex?
If you are already divorced, or close to being divorced, you may want to cut your losses and move on with your life in peace. However, obviously this is a personal decision.