Dheeraj, Essentially, you should have gone to the RPO in India and submitted a form to correct this. It takes only few hours and gives you peace life long.
Though, I do not have an official answer for you right now but you can certainly call on the phone numbers provided on the link below. AINP officials are nice and kind in responding.
http://www.albertacanada.com/immigration/contactus.htmlTell them your situation and ask what you want to and then post it in this forum so that others can take help.
Good Luck.