IIRC, Marriott Guest Relations is in Salt Lake City, Utah, and their headquarters are in Virginia, just outside Washington, D.C....
Whenever I've contacted elite guest relations, I invariably get someone in SLC. Nice folks. "Thank you for choosing Marriott, Mr. camachinist"...
Sounds like folks are getting contacted by Interstate Hotel.....perhaps they're trying to do an end run around Marriott corporate.
Pat