Poor service followed by aggressive marketing after cancellation

I cancelled my contract with Fidelity-ADT almost a year ago because I was getting very poor service. Over the last few months, I have been increasingly bombarded with unsolicited SMSs and e-mails encouraging me to sign up for security with them again. The last two e-mails I received are aggressive fear-mongering attempts which are uncalled for, and there is no unsubscribe option on the e-mail. Kindly remove all my details from your database as I have no intention of ever using your services again.