Notifications

I am receiving security alert notifications from a website that is no longer connected to my HUB (wavehuggers.com). They are starting to get kind of annoying, so I clicked 'unsubscribe', only to run into an error telling me that the operation is not allowed. I am unable to find any setting or preference that'd allow me to turn these off permanently. The email is here: http://stoneagefarmacy.com/wavehuggers.pdf. Thank you for any guidance you may be able to provide.