Pathetic Kulula Aiime

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, they over book their flights and just cancel anyone that they want. Please flipping explain because I need to explain to my bosses and to people that I will be letting down???