This is why travel agencies and travel travel related companies purchase E&O insurance to cover errors and omissions. This does not sound characteristic of the Marriott I know, and it is really a mistake for the RI not to honor rates posted on their web site. Someone, and I would guess it is at the actual property level, is more worried about his/her E&O insurance premiums going up than honoring reservations made on their web site. A bad will move IMO.