Very unhappy about Kalula delays????????????

kulula.com: Apologies your flight MN468 Ref KTKBBZ has been delayed. It will now depart at 13:35 on 15-06-2019. Check in closes 45 mins before. 0 ********** 52 I have a appointment at 12h00 in JHB There is reasons why we book our flights at a set times I will never book with Kalula again 6 hour delay is totally unacceptable.