Email opt out

Got this email this morning, that says I'm "missing out on great deals, offers and important updates because you've [sic] opted out of receiving our emails."

So why have you sent me an email telling me?! Isn't that half the point of having an unsubscribe button? Clearly the unsubscribe button only temporarily removes you from their mailing list. Are they allowed to do this?

Thankfully, there's another unsubscribe button at the bottom of the page. Hopefully this one works. Forever.