Stop spamming me, OMMA!

I'm registered for the OMMA conference in New York right now. They are supposed to be an industry leader and are breaking one of the biggest rules of permission marketing - don't abuse the user. Since yesterday morning I have received a total of 7 emails from them - although I hit unsubscribe after the second.
Yes, according to CAN SPAM they're ok because they have a few days to take me off the list - but it's highly annoying and I don't want any of it.
Play by your own rules, OMMA!