Unfortunately, YOU chose to book a cabin on the lowest possible deck the ship has to offer. The deck under your cabin I can expect that there was some sort of crew WORKING area like engineering since the deck above that (the Riveria-Deck 1)‚  is where passenger cabins start. I wouldn't be so quick to blow off Carnival (sailed with them 5 times of 12 cruises and had no issues) but I would in the future, have deck plans open to view what is above and below you while you talk to your agent. And stay away from the lowest deck. Sorry but this one is on you my friend. ALL ships have cabins in locations that are less than desirable. It is up to you to research and book what you know you will be happy with.