Canadian Tire

Brought my Jeep Cherokee to Canadian Tire on Appleby in Burlington on November 16th to install my winter tires and got a call back saying there was a nail through the side wall of the tire and they had 2 tires in stock that they could use right away. The tires were 225/55-R18. 2 tires cost me 738.41. Went to pick up the vehicle today November 20. Summer tires were missing and was told they had thrown them out. Fortunately, after double checking, they were still outside in the scrap tire pile so I did get 2-year-old Perrelli summer Tires back.
I Had asked Helen at the service desk to see the nail in the bad winter tire that was removed in the spring and she claimed the tires were thrown out and not available to see. Fortunately, after retrieving my summer tires I found that they were not thrown out and the 2 supposedly bad winter tires were there. The mechanic servicing my vehicle showed me the tire which I now have in my possession and the screw was a tiny little thing sitting in the middle of a tread that was easily removed with my fingers. There was absolutely no reason to buy 2 new tires and no reason why I couldn't have used the winter tires that I brought in. Nothing was said to me when the Summer tires were put on in the spring so kind of questioned this from the get-go but didn't bother asking to see the tires prior to giving them the go-ahead.
Gave them the go-ahead because I really thought Canadian Tire was a reputable Corporation but have to question if they are just there to rip consumers off. They should have told me the truth. The screw didn't even puncture the tire. How does something like this happen? Do I stop going to Canadian Tire? I wonder how many other people this has happened to? Do I have to question all the work done there every time there is additional work needed by what I thought was a reputable company? Really not happy and wonder what if anything I can do. Can I return the new tires and request a refund and put my existing tires on or can I get 4 new tires? Something definitely needs to be done.
Seriously not impressed.
Mike Squizzato