I am sorry to hear this happen to you and thank you for taking the time to provide such detailed feedback about it. I regret the issues you’ve encountered and apologize for the disappointment you have faced. Cloudflare aims to provide best services and products to everyone.
If you already have a ticket, Support will respond to you on that ticket. Questions about billing will need to be resolved by the Customer Support team and cannot be resolved on the Community.
I believe someone from the billing team will take a look at your case and respond to your ticket. Please rest assured that Cloudflare is addressing these matters internally since recent Billing migration.