Traveling from Canada to Pakistan on Pakistani passport. Do I need a transit visa?

I have 23 hours layover at Beijing Airport. Do I need Transit G type to go out of the airport? If yes then How do I get a Transit G type? Because I went to chinese consulate General in Vancouver ( Canadian city ) with all required documents and they told me that they serve only Canadian nationals in this Visa office. Is there ANY way I can go out of the airport? Thanks.