I'm sorry you feel cheated, I truly am. It would be helpful if you focus on that when you read the rest of what I am going to say because it will mitigate the risk that my intent is lost in the cold callousness that is the internet. Here goes.
Keep in mind that I am no Disney apologist. I love Disney and I love
DVC, but if you read my posts on here you'll see that I am quick to call them out on things where I feel they can be better. In this case, I don't think Disney did anything wrong. The initial online chat representative told you the truth and it is probably way above her pay grade to parse communications to the point where she has to identify those who want to write a contract that night and those who are simply inquiring for informational purposes. Truth be told, you waited until 40 minutes before the deadline that had been publicized for two weeks to have someone write up, execute, and sign a contract for a major real estate purchase. While I understand you are disappointed, this one is kind of on you.
So remember that part in the beginning where I said I'm sorry you feel cheated...let's get back to that for a second because I am sorry you feel that way. But I don't think it's going to be helpful for you to continue to have those feelings and it definitely will not be helpful for you to pursue it when you are there in November. At that point there's really nothing they can do and you're just going to dig down deeper into your resentment. What happened to you sucks, and I'm sorry it didn't work out. The advice on this thread is going to hopefully help you work out how you proceed, and I wish you luck.