Never said it happened to me. Read the post.
ETA: Once a reservation is gone, it's gone. Especially on the DVC end, where there IS a waitlist. Again, this particular OP hasn't specified the way they booked. But when a mistake is made on the DVC end, the room is gone and there's no way to get it back.
So why are you on here giving out information of which you have no first-hand knowledge of? You claim people lose reservations by calling in and modifying them, though this has never happened to you . . . I don't see how simply making up things and posting them on here is helpful to anyone.