Call the number back and wait... it will eventually answer and let you know that it's a call from a marketing group. If you press '1' during the message they will remove you from their list and stop calling.
i get called every day from these poeple,no messages or anything like that,today was 4 times,and 3 or 4 times a week,and best part about it ,they are calling my company phone,which is on the,do not call list,so much for that bull crap,
3 days straight they have called and I tell them every time you already called me last month and the day before about a home security system. I told them to stop calling and also that I am on the DNC registry. They do not get it, so today I filed a complaint on the DNC website.