Just mark the emails spam and forget about them. If everyone blogged about every spam email they got we’d get articles every day about spam emails everyone got.
Had the same problem with Peacock despite constantly attempting to unsubscribe and mark spam. In the end I just created a filter rule to throw it in spam.
If you're in the US, I've had success by contacting customer service and threatening action under CAN-SPAM. The FTC has never really provided an easy way to file complaints or request enforcement by the public, but it seems to get their attention all the same. Now is a good time to try to exercise your legal rights against corporations before they are all executive order'ed away.
I missed that FAQ item, thanks. I've seen (and used) the "report fraud" page before, and I had seen something to suggest that it was the right place to report illegal spam, but it wasn't clear how "spam" and "fraud" were related.
I just said something like "If you don't remove me from the list within 24 hours I will report this to the FTC as a violation of US federal law." That's the easy part, the hard part is actually getting through to someone.
That might be out of concern of bad faith users abusing such a feature, such as folk who actually opt into a newsletter and then feed the results into such a filter.