Sent an email to email@example.com
explaining I was unhappy with the recent changes to the Marriott Rewards scheme so was not going to be staying with them anywhere near as much in the future.
Sent a screenshot of my Marriott account and my Radisson Rewards number and got an email reply with abour an hour confirming Gold status till Feb 2020.
Reasonably happy with that as I'm pretty sure I'll hit Platinum with them within a year anyway.
Platinum Premier Elite with Ambassador
on December 10, 2018