Called and after 1 ring they hung up.

Man called selling extended warranty coverage on automobiles.  Claimed to be working with Lexus, but did not know we already had extended pre-paid warranty coverage from the dealership and didn't even know which dealership we used.  Must have gotten contact info from public records or something.

called and hung up. Don't know who it is.

Called and left no message several times over the past week.  I answered it this time, she knew my name and then she hung up when I asked what she was calling about.

Called more than once and left no message. I'm assuming a telemarketer.