Dirt bags keep calling from; Norwood Young America, information gathering town in Minnesota, beware! Anyone else?

I have no idea why this number keeps calling. There's never anyone on the other end when I answer. I run a business and I hate blocking numbers as I don't want to block a potential customer by mistake, but this is ridiculous. Then I call back and get a busy signal. Or today when I called back, it rang and rang and I finally got a voicemail that said it was Haibu. Like Hi-Boo. I have no idea what that is.