After several hours of work between cloudflare and my Nginx ( In pro-plan from the beginning ) , my website finally works well, then 8 hours later Cloudflare send me a message
"We are sorry you no longer need Professional Plan for forocom.com.
This is a confirmation that your subscription was canceled May 16. As a reminder this means you will no longer benefit from advanced security and performance benefits only available on the Pro Plan."
The problem is that i never change my plan 1000% sure.
The problem was reported ( Request #1523603 ) but 8 hours later, not response from you guys.