To OP, I feel your pain. I booked same room for a 2015 Christmas cruise on the Fantasy. I have an autistic teen who is very private and I also have a toddler. I felt this room was a great solution as I could not afford a 1 bedroom suite.
My room was also changed by Disney close to sailing, I was not upgraded, received no onboard credit, and when I called DCL, they had no idea why they changed it.
My family blamed me and was so upset with me. Just seems odd that it was the same room.
Wow I am really surprised that they just moved you from the same cabin I had and did not give you any reason whatsoever. That is the complete opposite to excellent guest service that Disney prides itself of.
I really really bad for what they did to you. Having an autistic teen makes things even more serious to me than the situation I have. They should have provided you with a better solution.
Thanks for your comments!!