We have had several call from the same man.  He asks for my husband by his first name only. When I say he is not home he says he will call back.  I have told him not to call back unless he states the nature of his call.  He has also states that he does business with my husband.  My husband has never heard of him.  I picked up the phone tonight when he called and asked to speak with my husband by his first name only.  I asked him if he did business with my husband and to identify himself.  Just as he was asking me who I was to identify myself, my husband picked up the other phone and told him to never call back.  I was very glad my husband was home when he called.  I have no idea what he wants or the purpose of the call.  It is creepy that he knows my husband's nickname and has our unpublished landline number. Our number has been on The National Do not Call Registry for several years.