The same thing here.  I asked if I could take a message and they hung up.  I called back and there was a mail box.  They called again while I was out (two hours later) and they had a "This is not a valid number please hang up and try again" message on the answering machine.  It was not even the phone company message, it was theirs followed by a beep.  I have no patience for people who hang up on me.