Carnival Cruise Lines review: Change of cruise charge

I had a cruise booked to sail from New York on Sept 14, 2024. I had some inconvenience with parking at the port (the parking is 5 blocks away from port), so I decided to change my booking to another that sails from Miami. We are a big group traveling with kids and NY is not a good option when you have little kids. We called yesterday to change all of our bookings, and when I tried to do mine, they told me my cruise was non transferable because I was on a casino offer. That was new for me, because I never go to the casino, I don't gamble. They said that I selected that option when I booked online. I didn't realize that, I never read anything about casino on my booking. So the cruise was payed off and they transferred to my new cruise only part of the money that I payed already. They said the deposit was not transferable and we are talking about 396 dollars. So now I owe 488 from my new cruise. I think this is not fair, because this is not my first cruise and I never had this inconvenient before. I want to somebody show me were it says on my previous booking that I was getting a casino offer. My booking was B2CM74. I am not requesting money back , I just want my money to be transferred to my new booking.