I have never used Greensideonline.com, yet somehow they got all the email addresses for a local charity I am involved with and repeatedly send unsolicited marketing emails. The unsubscribe emails don't get actioned and they have so far not replied to a single email I have sent them asking to remove email addresses from their lists and provide details of how they got the email addresses in the first place.
Complaint form going into the ICO at this rate!