As someone who has probably made probably hundreds of those phone calls, there’s a litany of reasons to phone the registered owner. Driver not matching the registered owner is a very common one. CPS would only have access to the main registered owner (which lists physical description). Maybe they were the subject of a complaint from the public and we’re following up. I’ve warned registered owners over the phone a lot when it’s not worth the effort to pull them over, it’s only going to be educational, etc.
File a complaint through
Calgary Police Professional Standards if you feel the demeanour wasn’t professional. Phoning a registered owner of a vehicle wouldn’t really be anything out of the ordinary though.