Requested through hiltonhhonors.hiltonapps.com/
on Dec 15, 2017 and got a reply on Dec 19, 2017
Sent screenshot of IHG rewards club membership card and past stay booking confirmation.
Instead of getting Gold, I was given Diamond which was awesome! However, I have to complete 8 stays over the next 90 days to extend my status through March 31, 2019. I can also earn Gold status with 4-7 stays before March 31.