They called me 3x today -- annoying. I called back and finally got through and got a recording indicating that they had some "special offers" for me. I was given the option to be added to the "do not call" list by pressing 1. We will see if it works.
It should be noted that I didn't start getting these calls until I posted my resume on job search engine sites. Suddenly I have an influx of strange repeated calls with no messages. This was just one of three different numbers.