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.
Two calls from this number, and it comes in as an international call from Russia. My caller ID recognizes it as a international incoming call. I never answer and they never leave a message.