Kulula making changes and not answering phones - left in the dark

My flight details were changed without any reason. No details were given other than that they were sorry, but here's your new flight number. A contact number to your call center was given, but the service doesn't exist. After holding for 16min your IVR told me that the number was not available. Rather ridiculous. I have questions. Am I being compensated for the flight changes? Can I cancel the flight in total because this no longer suits my plans? What about the, 'special' seat you charged me for? Do I get to pick my seat? Is it the same seat I picked originally? I don't see why I have to forced to pay for flight lock deals/flight insurance packages to 'protect' myself from unforeseen changes on my side, but your company can simply make changes to my life as you please.