Matt - I did not send a letter. Instead, when I got my plat concierge welcome what can we do for you in advance email, I indicated in the comments "well, not too much because I have canceled this res, and 4 more, due to blah blah blah."

Who knows if that will get to anyone who matters - but I figured it had about as much chance as a letter does!

Even more interesting - I did not do that until this afternoon - when I still had not received a phone call from the suite cordinator. (more than 72 hours after leaving my message.)

I am the first person to stick up for Marriott with regards to service issues and errors - mistakes do happen. However, even I am coming up short on a possible explanation as to why it would take 72+ hours to return a phone call regarding a paid suite res!