They called once, and said "hey, this is John, is Tom around?", then hung up immediately. 5 minutes later, he called again and said the same thing. I just said that there was no one with that name in this household, and then he just paused for several seconds and hung up. About 3 minutes later, this number called me again! That was very annoying. I have blocked the number. I think you should do that, too.