I’m experiencing the exact same error. Now my domain has expired. I opened a ticket more than 1 month ago. I even tried calling sales. Can you please escalate mine too 
What is the name of the domain?
What is the error message?
internal server error
What is the issue you’re encountering
Unable to update payment method
What steps have you taken to resolve the issue?
My credit card expired when my domain was renewing like Billing Broken & Customer Support Terrible. I attempted adding multiple payment methods with and without PayPal. I tried with and without incognito. I tried with and without VPN. I tried multiple browsers on multiple platforms. I tried different times of day for a month already. I found multiple related unresolved forum posts. I sent a support request and tried asking enterprise sales for a callback. PLEASE HELP!
Billing issues requre a Billing ticket with Support
01345695
In what area can we help you?
Payment issue
Thank you for merging my post. I confirm identical error messages, screenshot, and steps as the original poster. I love all Cloudflare’s products but also considered switching because of (temporarily) losing my domain without recourse. Support just replied to my forum post requesting a HAR file. Update soon 
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