Someone from this number called, when I picked up he responded with, "Hello, B*tch." I don't know why, but I gave him the benefit of the doubt (maybe he didn't say what I thought? maybe this is how he greets some close friend who knows that it's a joke?), so I told him that he had the wrong number.

He responded with "Hello, B*tch" in an even louder/clearer voice. I guess just to make sure that I knew that he was insulting/harassing me. Didn't sound like a child or a teenager. Just an angry dude who likes to take it out on others, I guess.

After I hung up, I called back (because idiot's number was in my callerID), but his voice mailbox was full.