Got the same call. Very strange. This time it was in Spanish and when I called it back it said "The number you are trying to reach is not in service".
Someone mentioned that if you answer it charges you $499, and if you press 1 then they charge you some other obscene amount? I called my service provider and they said that the number did not have any charges attached to it.
I am not sure how that statement could be true, but I decided that I would call and make sure. Of course, I did just get this call like 15 min ago so a charge could appear later, but I doubt it.