They have called 7 times since 9 yesterday morning. Most of the time I just let it ring, but 3 times I picked up and said, "Hello." Immediately after that I heard a dial tone. Two times I called the number back right away, and all I got was a recording telling me that it's not necessary to dial "0" or "1" before the number. That's interesting, because I didn't; I just dialed the number. Scam of some sort, I'm sure.