3 or 4 rings then hung up.  Caller ID said "Unassigned"

Silence when phone was answered; caller hung up after a few seconds.

Got same call at 12:58 Wednesday, 12:59 Thursday, silence, caller hung up after a few seconds.

This is an energy supplier that wants you to switch to them from P S E & G in New Jersey.  I was connected to a live representative today, but I immediately cut him off when I realized who he was.  I've received several similar calls lately.

These people simply will not give up!  They called me again this morning.  This time I gave their representative a few seconds to make his pitch, after which I politely asked him to put me on their DNC list.  He refused to honor my request, even after I made it three times.  I finally had to hang up on him in mid-sentence.

Calling the number back gives either a busy signal or a recording that the number isn't in service.