Comcast spam filter does not work on spam but increasingly blocks legitimate e-mails.

I had this problem in August two or so years ago and then in February of this year and now it's back.

Comcast is flagging e-mails from [Edited: "Personal Information"] as spam, sending a spam report to MailChimp, and getting my address blacklisted.

When I went through this last time, support told me to add them as a "safe sender" which they already were (in fact they're the only e-mail in that list).  Then support helpfully deleted all of my mail filter rules (without telling me of course) even though they weren't the problem either.  I have the option checked to turn OFF automatic rejection and let mail hit my filter rules precisely because I don't trust Comcast not to do exactly what it's doing now.  And I've NEVER manually flagged a BBTS e-mail as spam.  There's no reason this should be happening.

It's ridiculous because the filter only kinda sorta works if it feels like it.  My inbox is flooded with phishing e-mails from "Netflix" and "Apple" and "Harbor Freight" and a billion Microsoft Azure bots peddling everything from time shares and [Edited] to power tools and fake cPanel alerts.  Sometimes even bank fraud scams from Nigerian princes get through!  But a [Edited: "Language"] toy store that I have done business with for 25 years, THAT'S what this dopey system not only flags but kicks back?  Seriously?

Is there anybody at Comcast that knows how their e-mail system works and might be able to stop this?  I'm so tired of having to fight constantly just to get order and shipping notifications.