Ya just email or fax them yourself. It's your career, why are you depending upon agents. You have every right to email them or fax them, unless stated otherwise. Better fax them, because email won't fetch you an answer. Don't depend upon agents dammit.... they don't care about you. Just make sure your language and grammar is proper in letter, and also make it diplomatic not like please stamp my visa faster.. something like please process my application at earliest. First paragraph explaining who you are and why going to canada. Second para saying.. give me my damn visa, but nicely.
See this is all speculation, if fax will work or not. For some it may, for some it won't, but don't take chances and not send it altogether and waiting for agent to do it. He has 100's of students like you, you are not special.