How many days has it been since they've contacted you? I know sometimes when I talk with some of the WCs it takes them up to a week to respond to me.
I do not have any experience with any of those companies, but if they have your money, they should be responding to you in some way. All I can say is keep trying and if no one responds, you can always let them know that you're filing a complaint with the Better Business Bureau (and then do so.)
I, personally, have not used any of the Hawaii wedding websites or dealt with their WCs. I am currently using destinationweddings.com which serves as a travel agent. However, they do recommend wedding companies to clients if asked. The two that were recommended to me on Oahu are:
Oahu Weddings by A Fairy Tale Wedding Honolulu Hawaii
and
A Dream Wedding Hawaii provides Oahu, Hawaii destination wedding planning info. & coord. services
I ended up using a different venue entirely, so I never really went through these WCs. However, I assume that if another company is recommending them, then they should be pretty legit.
I really hope that helps out some, and I feel so bad that things aren't working out for you! Let me know how everything goes and I can try to help out if you need it.