Mariann,
Check with your agent or carnival rep to see if there is any other options. Have them check up until boarding if necessary. If not then I would advise you to go directly to the pursers or call them at first noise and have them make a "Written Report" on the issue. Keep doing that as often as it takes. You should get some sort of compensation. In my instance I said those cabins should be sold as "night owl" cabins. Since we missed a tour in our first port to stay onboard and SLEEP we got the tour $$ refunded, but only after much hassel. Then the % off a future cruise. I would also advise you to ask for shipboard credit so you can spend the $$ at the noisey time in the casino or bar......I wish you good luck, noise free sleep and calm seas for your sailing.
Renee