An actual person rather than a robocall, left a message on my answering machine. Caller id said SSI. Message consisted of the person giving his/her name (couldn't understand the name, Chase, maybe?) and saying he/she was calling on behalf of the National (couldn't understand this word) Search Firm. Then the message cut off.
Survey Sampling International:
SSI is Survey Sampling International, a survey company and has nothing to do with the SSI program by the Social Security Administration, nor does it have anything to do with the Administration itself.. Opt out: https://www.surveysampling.com/contact/
I don’t personally know if the above link will actually take you off their list, but I have been told a couple of times that it does work.