I have received 4 calls in 3 days. Never leave a message and I never answer the phone when I see a number I don't recognize. I decided to block the number and be done with them. (I am sure that they will use a different number and continue to call, and I will continue to block them - heh heh)

Received a phone call from this number. The caller left no message.

I get calls from this number constantly, but nobody ever leaves a message.  Really annoying!

I constantly get calls from this number.  I have only answered once, at which the caller hung up.  The rest of the times, no messages are left.