The issue here has nothing to do with Platinum status. It is outrageous that you booked a 9A guarantee and given a 9D. Not acceptable at all. This is not a matter of upgrading either. You just want what you booked. I have stayed in that stateroom 7006 and didn't like it at all because the porthole has an obstructed view and that matters to me. ( It is a huge room and some people will love the space) I would book a 9A because those rooms have awesome portholes but never a C or D. Your complaint needs to be about your downgrade, not your status. I have been on 12 Disney cruises and had several upgrades along the way but never expect one or feel I deserve one. Also they told you they only upgrade if your type cabin is not available-that is not true.