Can't send email messages but can receive them; also the AI is worthless and acts as a firewall to talk to anyone at Xfinity

I cannot send any messages on either of my addresses in my account.  One account was [Edited: “Inappropriate Language”] for a while, but then today the other account was [Edited: “Inappropriate Language”], too.  I went on a chat and the AI was not only worthless, but obstructive in getting to talk to a REAL person.

Initially, I asked the AI for help on email, stating, "I can't send any emails from either of my email addresses on my account.  It is an error 550.  It is independent of any email clients I am using, and also happens when I access email throughhttps://connect.xfinity.com."  The AI replies, "Comcast.net accounts will soon be able to upgrade to Yahoo Mail.  Your account is not ready to upgrade yet so no action is available right now.  We'll email you as soon as you're eligible to upgrade."  That's all of it, no help.  So I replied, "[Edited: “Inappropriate Language”] are you talking about?  So I'm without email service?  This is UNACCEPTABLE.  Connect me with an agent, NOW!"  And the brainless AI just repeats what it said before.

This is the [Edited: “Inappropriate Language”] that any business can give to its customers: "We don't want to hear from you; we don't give a [Edited: “Inappropriate Language”] about you."

[Edited: “Inflammatory”]