I've recieved the calls too and its driving me crazy! I've missed most of them and I leave my voice mail on my cell full b/c I don't like getting voice mail (wierd pet peeve), but I did answer a couple of times and I get the same thing, dead air!
I'm from michigan and the reverse lookup gave me Ohio as a location as well. Not willing to pay $15 to see who it is, but if any of you do find out, please post it here!
Message says "GE Money re: your Gap Card" but when I call Gap customer service they insist that my account is closed/ zero balance. I wouldn't call that number back. And never never would I give out an account number to someone I didn't call myself.