Leepopo,
I don't know if this will help you or not but here's a link of info to 'update your application':
http://www.canadainternational.gc.ca/ghana/visas/update-how_mettre-comment.aspx?view=d,it
Or try this:
http://www.canadainternational.gc.ca/ghana/contact-contactez.aspx?view=d,it