I unsubscribe twice (allowing for one possible bug), then spam.

And, as others have noted, unsubscribe cannot involving going and logging into their system. If I need to do that, it generally goes directly to spam.

I unsubscribe, and immediately set up a filter to mark any email from their (sub)domain as spam. Too many sites keep spamming for a week or two after unsubscribing, that behavior deserves a reputation drop.