Several hang up calls from this number.

I assume it's the "usual suspects." One of the calls in the 312-340-55__ series had said "WINTER SAVINGS" and this may be just a variation. It appears someone got the brilliant idea to use the spoofed company ID as a short sales pitch, as though it were a legitimate thing! I suppose we can expect more along these lines. I hope, hope, hope the feds and geeks are preparing a sting even now, that will take these criminals out once and for all.