The call came in on my unlisted cellphone which I have had for more than a year without any such calls. This means one of two things has happened. One-One of the non-family persons I have shared the cell number with has either sold it or has been hacked allowing it to be stolen. Or two-The caller is useing an illegal auto or robo caller to rapidly call a series of numbers which included my unlisted phone number.
The caller did NOT leave a message. I set the number to auto reject. Now it wont even ring through.