I am also missing 4 stays using reward points. One on November 1, one November 18, November 22 and November 28. I have been one stay away from diamond this whole time and it is making me nervous. When I emailed Hilton I got no response. Is there a better way to deal with this issue. I saw on the website it says stays may take up to two weeks to post, so I was going to wait until tomorrow to call someone as that will be two weeks from three of those stays. I just need the night credit to retain diamond. I did not have any incidental charges.