Yeah, I just got a call from this number leaving a message on my phone, when I called him back, the guy didn't speak clear English, he said he was the legal dept, I just kept on saying, What? What? and told him he had the wrong number.Then he asked me what my name was and I was like, I am not going to tell you my name, give me your name, he said it and where he was calling from, but I couldn't make out what he said, because he didn't speak clear English but had an accent, so I asked him again, and I kept on saying What? What? cause we also had a bad connection, so I said this is the person you just called and left a message on my phone, you have the wrong number. Then he asked me what my phone number was and I told him so he could take my number off his list. Then he hung up.  
By the way my phone is a brand new and I didn't even give out the phone number yet.

I suggest you tell him he has reached the Central Intelligence Agency and that his phone call is being recorded. Or act all dumb and clueless and keep on saying What? What? and then ask him questions, not the other way around. I think this guy was a little freaked out, and hung up.