Extremely disappointed and Unhappy Valued Guest

I am extremely disappointed with the terrible service from Mango airlines on 24 March 2016. I was scheduled on flight JE267, depart ORT at 17:10 on 24 March and was scheduled to arrive in Durban at 18:20. There was an apparent delay which most passengers including myself were not aware of. I work for a large audit firm and was expected to meet an important international client whom I was in the country and was leaving to Cape Town. Later when at the boarding gates I was informed by other passengers of the delay. Due to the 1 hour, 7 minutes delay, I was unfortunately unable to make this meeting and it has however impacted my work in a negative manner. The next day I received a sms from Mango to apologise for the delay. It would have been much more helpful if Mango sent this information prior to the departure. If this was done, I could at least informed my prior to the delay instead of looking unprofessional. Being a valued Mango Guest whom travels regularly this is not the service I expect. This has occurred on a number of occasions previously, I did not complain however. Now that it is becoming a recurring matter I will think twice in future before using Mango Airlines.