I received the following email from Xfinity <email@example.com>:
Unfortunately, there is not much that can be done about these types of emails here in the forum. You will need to report these directly to Comcast's CSA team. More information on how to report these emails directly to that team can be found here: https://internetsecurity.xfinity.com/help/report-abuse/#tab-spam
from the Comcast site:
"Report Phishing Emails
When reporting phishing emails, it is critical that you send us the email headers. Please do not forward the phishing email. Forwarding the email will remove the original headers.