I just got the same call from this number. After I said "hello" there was a pause, then an elderly sounding lady said "goodbye" and hung up. Weird!! I would love to have this number tracked.
Someone on the other end, garbled. When I said Hello the second time they hung up. Called back the number and it said "The number or code you have dialed is incorrect. Hang up and try again." How do they get away with that?