Hung up on my answering machine. They always do which is why I never answer my phone. I have a unlisted land line so that tells me who ever it is is just auto dialing. I get the same crap from the 301 area code. If you have a cell phone and they are wasting your calls report the number to the FTC and the FCC. Demand punishment.
I missed a call from this number as well, but I called it back and right away I was prompted to remove my number from the calling list. All I had to do was press 1. In total I think it probably took less than 10 seconds.