Thanks for posting to the Xfinity Forums to make us aware of the issue you're having when attempting to pay your bill online. I'm sure it can be pretty frustrating. I can help troubleshoot to get this resolved if it hasn't been already. Can you please provide more details so I can begin?
What type of device are you using?
Using the My Account App?
Can you send me a private message with your first and last name and the username you are using to login when attempting to pay your bill? I'd like to make sure the username is linked to your account on the backend.
To send a private message click on my name "ComcastChe", then click send a message.
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