Who called from 2132323239

Just got two calls from this number (I didn't answer)..Called it back and a message stated that a "this number is not in use, goodbye."

This number called me atleast 3 times this morning.  First at 5:41 am.  I didn't make it to the phone to answer.  Again a few minutes later.  I picked up but no one was there.  I then called the number, but an automated message said the number was not in use.  I then turned the ringer off the phone, but apparently they called back atleast 1 more time.

i got two calls from this number, first at 5:35AM and second at 5:42AM. I too called it back and received msg that the number is not in use.

Keep getting called over and over

Rec'd 4 calls, so far, from this number. Just get a tone signal.  What's this all about?