Comcast filed another fake spam report to blacklist my e-mail from MailChimp

About two or three years ago, Comcast's e-mail system decided to mark e-mail notifications from a store that I purchase from frequently as spam.  That triggered the store's mail service to put my e-mail address on a blacklist.  None of the[ Edit: Inflammatory] in tech support could figure out what happened but I lucked into finding somebody here that actually knew something about e-mail.  That guy reached out to MailChimp and got me removed from their blacklist.

And now it's happening again.  I was unable to reach anybody at MailChimp myself as their support pages are all jumbled probably due to being acquired by Intuit.  Please help.

PS - I wish the millions of e-mails that I actually flag as spam would stop as quickly as the ones that Comcast mysteriously flags on its own seemingly at random.