Cemair review schedule 14 hours before departure

I had a booking for 26 Dec @ 6:45 Jhb to George. I checked in online and on 25 Dec @ 15:27 was informed that the schedule changed to 11:35. How is it possible that a schedule can be changed on such short notice and I need to be in George at 10:000. This is not the first time it happen with me on CemAir. Will never book with them again