Imagine you are the supplier, where is your responsibilty to your customer. They have problem, do you just push away. Come on man just be a responsible guy to everybody including yourself.
Your thread title already comes close to libel. Please cool down and start assessing the situation from a neutral end.
The warranty situation has been explained already: 7 days 1:1 exchange by the shop, all the rest goes via Canon. Shops don't do a quality assessment of the goods they get delivered, that would require them to open all packages which is not possible in all cases. I'm sure you have noticed already certain quality labels on packages. If you have inspected the camera in the shop and purchased then you have accepted the camera in the condition "as is". Since you cannot even safely state whether the lint was in the lens when you purchased the camera I suggest you stop blaming other people. Every claim after 7 days is useless, the shop is not obliged to exchange. If they do it's nothing but goodwill. Your next point is Canon Service Center. Anybody else opening the camera will viod the warranty (pls see T&C of warranty card).
Secondly: leave it up to CSC whatever they want to do. If they open the lens and use a blower then it's their decision. Finally you want to get rid of the lint and not a discussion about Quality Control and service activities, correct?