Is there an email address I can send a detailed complaint to? I'm not interested in talking to yet another rep, I just want a place to contact corporate via email. I have searched this website and there is nothing.
They don't offer email support. They did long ago, but closed it down some years back. You might give "Send Tom Feedback" a try: https://support.xfinity.com/svp-contact-form. Be aware that responses from that office vary from extremely helpful to nonsensical.