I had a problem last year. Was at 59 nights before a 6 night stay starting Dec 30. Called diamond line before stay and was told Dec 30 would count for 2017 and if it posted to 2018 to call after the stay and they would change it. It posted to 2018, I called and endied up talking to supervisor who said too bad. She would not budge even though rep told me beforehand I would get credit for 2017. Sent an email to
[email protected] and they fixed it.
Good luck