Delayed and Changed flights

<p>I was booked in for the friday 8pm flight to Joburg and would land at 9:15 as that was the most affordable. I was visiting friends and they had planned a big night and that flight was still reasonably early too for a friday. I then got an email to tell me i was only taking off at 9:35pm, 20 minutes after i was suppose to land! My whole evening was messed up! I understand 30-45 min delay but an hour and a half is absolutely obsurd! I only land at 10:45! I dont know if they combined flights but i am seriously angry and not impressed with Kulula and they didnt even give me a reason for the delay!! </p>