Dont answer #s not in my contacts

They keep calling and nobody is at the other end

This number called me several times, and I didn't answer, because I didn't recognize it.  I finally got tired of them and answered, and got some guy from something-something auto care, who asked me how I was doing.  I said i was fine, but not interested, and asked to be removed from whatever list this is.  The guy said, "mmm...no."  I hung up, but am now seeking action against them, should they bother me again.  Any ideas?

Seems this is a new telemarketing number...setting to auto-voicemail.  Hope they DON'T leave a message.

I get calls from this number off and on all the time, but have never answered it.  I just now called
this number, and a recording came up stating, "The number you dialed is incorrect".  So this should
tell all of us, it is NOT a reputable number.