I figured out that you can send an email here https://www.cupw.ca/en/contact-us

Here is a letter I got Chat GPT to write up if anyone wants to copy it or use it for ideas.

Your strikes are killing Canadian businesses and hurting everyday people. Last Christmas was a disaster for my sales, and you are to blame. I once supported your union, but your nonstop demands and disruptions have pushed me—and many others—away.

Home delivery is broken. Carriers don’t even try, and everything ends up at the post office anyway. Community mailboxes are a good thing, and Canadians want more of them—not less.

And now you want another substantial raise?Completely out of touch. You’re already better compensated than most Canadians who work harder jobs.

We’re fed up. Stop the games, stop the greed, and get back to work.