Same thing, although my phone call was from 213-337-2559 - they wouldn't give me time to discuss the offer with my spouse and said it was a "live" offer. They did have my IHG rewards number and point balance, so it seems like they are legitimately connected with them somehow. I didn't bite but did keep them on the phone for 20 minutes.
Received a call from 703-886-9880 on 6/3/2014 at 6:06pm EDT. Caller ID displayed "Name Unavailable". GV already has this number on their spam list so my phone did not ring and the call was immediately directed to voicemail. A message of 16 seconds of silence was left.
Based on the comments posted here I have added this number to my GV block list.