@ csqmjj
You can extend your work permit at the border, with your CSQ!
You need: Original (!) Job offer from your current employer with start/end date, salary etc.
Photocopy of your CSQ
Copy of Receipt that you have paid the PEQ Fees, and the AOR letter from that, just in case
150$ Cash ! (Border "Bernard Lacolle", 30min from Montreal)
That's the way how I got my permit extended. This Law is new.
Read > http://www.immigration-quebec.gouv.qc.ca/en/immigrate-settle/students/stay-quebec/application-csq/students-quebec/after-csq.html
does it help?