Don't bother.
Amex seems to be able to immolate themselves with no aid whatseover!
For at least 25 years that I know of.
When Amex lost the exclusivity at Costco, I smiled all day.
I'm still smiling today.
Yes, loosing Costco was a good thing. My old company card was Amex. I have no ammo left. Since they pulled their support quickly that satisfies me.
Our dollars are the only vote we have.