I think you better to call police to help you , on the other hand , you can try to use media , like singtao , mingpao , fair child TV, internet (youtude) to show your case,
In Toronto , chinese society is not really too big , chinese guy always go to chinese mall, Pacific Mall , china town . I think not too hard to find out that guy.
Good luck !
悬赏千元寻证人:假汽车保险把我害惨