411 listing spam.  I have received a few missed calls from this number and they never leave a message.  I called back but blocked the number and it was out of service.  I decided to call from my work phone without blocking it and some lady answered saying she called me then announced the name of my company.  She kept insisting that she personally had been the one who called me at my office (which has never received a call from this area code) and finally I told her I called and was looking for someone else.  She yelled "wrong number" and hung up on me.