OP-- is this being escalated beyond your Platinum Concierge? I understood that she spoke to the GM this morning, but Starwood corporate really needs to be aware of this practice. Even beyond the terrible situation you were in last night, I can't imagine what it was like for those who were not travelling for work (i.e. not being reimbursed if they were able to find a room elsewhere at an extremely high price) and I wonder what many of them ended up doing.
How would I contact corporate? I figured the Platinum concierge was my best bet.
For those asking how many people were placed in this situation, the GM responded to me. Here is a quote from his reply: "Yesterday I had seven credit cards decline, I made the decision to release the rooms. Never heard from four of the seven, today three people don’t like me. (I did send e-mails to those guests as well)"