Called for Interview but couldn't tell me what the position was for.

Called me to try to get me for a job interview but couldn't tell me for what position.  I told him I am not wasting my time and going on an interview when I don't even know what it is for!  You could totally tell he was reading a script.  He eventually said, "Sorry to disturb you."  A major reason why I don't like making my resume public!