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Thank you BeShoo.

I will try to look up some more information.
 
Alisa:

You've probably found this information in the meantime, but I happened across this information. The best way for you to get a TRV extension would be to visit Buffalo in person. As long as you're not from a country with a mandatory waiting period) (I assume you're from Thailand?) you should be able to get your passport back with your new visa the same day.

I found some very helpful information on the University of B.C. website: http://www.students.ubc.ca/international/international-students/study-permits-visas/applying-for-a-trv-after-you-have-arrived-in-canada/