According to http://www.canadainternational.gc.ca/france/offices-bureaux/holidays-conges.aspx?lang=engDedicated said:Guys, do you happen to know when they resume working after Christmas holidays in CIC?
Official holidays for dec 2016 is 26th and 27th, and 2nd Jan 2017.
According to http://www.cic.gc.ca/english/passport/map/holidays.asp
They will be closed for 26th and 27th December. it is safe to assume they will be back to work from 28th December to 30th and resume on 2nd or 3rd of Jan 2017.