They called my very private cell phone number at 9:48 AM PST on 28 November 2016. There was no caller ID, just the phone number. 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.

Never call them back, not even from a blocked phone. They have ways to unmask your phone number even when it is blocked.