These are people who can't understand what they read in your Craigslist ad...which states don't need help in selling or helping others to finance a car.  This is a cash only sale.  They are dumb [***] and wanting you to pay a fee and they guarantee they will sell your car.  Don't take the bait.  Block them on email and your phones.  It comes up as a Las Vegas, NV number on caller id.  BEWARE!