http://www.marriott.com/marriott-rew...litebuyback.mi

"Just email Marriott RewardsŪ ([email protected]) with your name and Rewards number or call Guest Services at 1-800-321-7396.

This Buy Back offer is available to members who have earned their status through nights and stays at Marriott brand hotels.

SPG members who earned Marriott Rewards Elite status in 2016 by linking their SPG and Marriott Rewards accounts are not eligible to participate in this Buy Back offer.

This offer is valid through March 31, 2017 and allows only one level of buy back, which must match the Elite level you enjoyed in 2016.

All Marriott Rewards program terms and conditions apply. Once your status has been reinstated for 2017, you can see your updated mobile Elite membership card in the Marriott app. If you don’t have enough points in your account, remember you can buy up to 50,000 points every year."

(If you need to buy points, here's the link for that).

https://buy.points.com/PointsPartner...EN&product=BUY

Cheers.