I sent carnival a letter a few years ago after a bad experience on the same ship. I got the information for where to send it from my travel agent. I received a letter with a gift certificate for half the amount I paid for the cruise and a coupon for 25% off a future curise. Also now when I book I usually get an automatic upgrade. Carnival in my experience will do there best to respond to you in a timely fashion and try to make you happy espically when the staff on the ship has not taken care of the issue. I can not find the address but I can ask my agent if you can not find it.