Arrgh! More Comcast Problems!

So Comcast, once I am able to get service with you, things are generally fine.  But having to call your representatives, get through the phone trees and various impediments, is a nightmare. 

I recently had to change the credit card on my account used for automatic payments.  I tried, I really tried.  But I had to give up after getting this error message on your website.  I just want to go online and pay!  Why do you have to make everything so hard?