But for the credit card dispute, "duress" may be the more proper word. This is somewhat similar to one of my comments in the Honey Money discussion. You signed it not because you agreed with it but because you weren't really given a choice.

I could see how the Singapore agent might not have fully understood the facts of the situation, might have gotten convincing information from the hotel staff (even if false information), and might not have even been a true Platinum Concierge (but possibly a standard CSR answering as a PC; does that happen in A/P, too?).

I agree with bizaro86 that all the info about the first reservations is confusing. I don't see any point in mentioning the 2 BR Villa, either. I don't understand what you mean about showing two printed confirmations. Do you mean 1) the printout from when you made the reservation one month prior and 2) a printout (that you didn't mention making) when you checked the same reservation a few days before departure?

Let me get this straight. After HUNDREDS of perfectly satisfactory nights with Starwood, this ONE scenario will do you in for the entire chain? So let's say that you go over to Marriott and have 98 perfectly satisfactory nights. And when one of their hotels screws up on your 99th night, would you then say that they were worse than Starwood?

I'm not saying that you haven't been wronged. You have. (Assuming all your facts have been presented accurately.) And though I think that Starwood should have already done more to correct their mistakes and the more significant mistakes made by this specific hotel, I don't think that you have done all in your power to help them correct it.

If it were me, I'd file a dispute on my credit card for the entire charge broken down as follows:
1) extra $800 for improper upgrade charges signed for only under duress.
2) $379 * 3 nights for the downgraded room contrary to the contract for the suite. (if they still charged you $379/nt for this)
3) $379 * 1 night for the room on the first night that was not made available until an hour after a very late check-in.
4) $479 * 1 night for the second night in which they forced the guest out of the room early at 10am. (Isn't official check-out time 11am at this property? If they hadn't done this, I probably wouldn't dispute the second day's contracted rate of $379.)

@:-) You should definitely open a proper complaint with Corporate Customer Service. In this link, Starwood Lurker includes information about optionally CCing the complaint to him if you send it to CCS by email.