Similar experience as a post few days back.
Bought 4 Winter tires from the Kanata, ON location. When I dropped off my car asked them what DOT are the tires going to be, don't want anything older than 2 years. Person at the counter said the Kanata location is one of the busiest location and tires have high turnover, so it would not be too old.
Low and behold, when I picked up the car two tires were made from 2015, one from 2017, and one 2018. They will accept a return for the tire nor swap newer tires!
Paid full price for 4 year old tires...