Received a call from this number.  Called back the number and a voicemail message announced:  "This is the research department...  If you are calling to participate in an opinion survey please leave your name and number and a researcher will return your call.  If you are calling for any other reason a reminder that you must leave your full ten-digit phone number in order for us to acknowledge your call.  Please speak slowly and clearly."

Oh, I am sure they heard my choice words without difficulty.

Then I blocked the [***].