They called my unlisted landline number at 8:13 AM PST on 9 November 2016. The caller ID said "CS FOLLOW UP". I did not answer. They did not leave a message. My phone numbers are on the Do Not Call list. I will report them to DoNotCall.gov.
The same people have called me from many different phone numbers with the same Caller ID (CS FOLLOW UP). They call several times a week at all hours of the day.
It is a scam, of course. The "CS" stands for "credit score" - they are tricking you into thinking that they will help you with your credit issues. All they want to do is steal your money. Do not answer the phone and do not interact with them in any way.
Never call them back, not even from a blocked phone. They have ways to unmask your phone number even when it is blocked.