They called my very private cell phone number at 3:08 PM PDT on 10 July 2017. The caller ID said "Temecula, CA". 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.