i have had a similar communication problem with Blue XT Sea. my initial e-mail was answered promptly, but none of my repeated follow-up e-mails were answered at all. not even an out-of-office reply.
then someone recommended Dive with Martin, and i am very glad i took the advice. small/fast boats, out early and back early, excellent DMs, and very reasonable price.
go on their website and you'll find Stacy Burton's contact info. she is their US rep located in Texas. she is a full-fledged travel agent and can make all the arrangements for you, if you need them. she found a great hotel deal for me and was very helpful all around. highly recommended.