Don't know who this is, when I picked up, they hung up.

Same here.  Showed up on the caller ID as Auto Sales, when I answered on the 3rd ring they hung up.

Auto Sales was on the caller ID.... he wanted to extend my auto warranty on a car that we have that is old and out of warranty.  Wanted to know my mileage (I said I didn't know it)  I told the guy I'd take my chances and he then got rude with me.  He said ,"You have no idea what I'm talking about" and then told me he would just cancel our warranty completely.  So I told him to go ahead and then I hung up.

Caller offered to "extend the warranty" on my car.  Car is to old to even think about "extending a warranty."  Answering machine took the call.  Now blocked by Digitone telephone blocking system, along with about 30 other numbers that have disturbed us.

Get Caller ID and screen out calls from names, numbers, places you don't know.  Everyone who answers and/or calls them back just reinforces their behavior.  Call blocking may discourage them for that particular call but they use robo dialers which don't care and they keep calling as long as you encourage them to continue with their game.  Complaints to DO NOT CALL or states attorney generals, even the FCC will not help.  They have so many complaints from so many people about so many numbers, they could not do you any good even if they wanted to.  Worst you can do is respond and vent; then they know they've got a live one and they will continue........That's my story and I'm sticking to it!