One call, hung up when answering service picked up call, caller hung up...we do this regularly, screen calls...looked at caller ID did not recognize number, and after reading other reports here, blocked number right away.
I received several auto-attendant calls from different numbers in a row; when this one came in, I answered, "I hope this is not another sequential dialer" and the man on the other end said, "you answer the phone like that? you are a [***]" and hung up on me. When I tried to call back, to report his extreme rudeness, I find the number is "disconnected".