Pathetic Kulula Airlines...don't book with them they just cancel your booking at the last minute

My flight is scheduled for Monday 7 May at 8.10am. I receive a message on Sunday night at 9pm that my flight is cancelled and I will have to take the 11.30am flight. When I check the status of the 8.10 flight it is still scheduled on time. Kalula this is pathetic. Please flipping explain because I need to explain to my boss's and to people that I will be letting down???