Are you using a Free plan?
Have you cross-checked if you’ve enabled and subscribed for the APO for Cloudflare feature? Have you tried disabling it and to cancel it?
May I ask if there are any outstanding or unpaid balance on your CF Account or even active and enabled service? 
May I ask if you’ve followed the instructions to disable and cancel your subscription for APO as from below article?
Furthermore questions about billing will need to be resolved by the Customer Support team and cannot be resolved on the Community. You’ll need to follow these directions here: