The problem with emailing any of the cruiselines is, if you have a T/A they are responsible for your booking. The cruiseline will not typically even talk to you direct (much less email) about your booking if you have a T/A.
If you do not and you booked direct, general res will have to field your questions. You email was probably forwarded to general res and agents at the cruiseline have a choice. They can fish through the many emails and answer all the questions or book another cruise on the phone. Maybe in the hundreds question emails there is someone wanting to book, maybe not. Since their performance is based on bookings don't expect a prompt reply if you recieve one at all.
A T/A is a way to have someone personally responsible to you and your individual needs. You'll find the cruiselines do a good job of dealing with the masses but not the same job in handling individual clients. That applies to the booking process, follow up, questions and especially customer service issues. There are some exceptions but with the turnover they have it's likely you won't get the exceptional people by chance. My advice is to find a good agent that takes exceptional care of you and stick with that agent.