Poor communication regarding huge flight delay

I'm sitting at King Shaka airport waiting to go back to Johannesburg. My flight should have left at 19:20 already but is now only leaving at 21:06. Almost 2 hours late!!! I could have spent that time with my fiancé - we only see each other 4 times a year as it is. I am extremely annoyed. Surely to goodness the airline knew a while ago that there was going to be a delay and could have informed us. Apart from an sms apologizing that there is going to be a "short delay" in boarding, I received no amended boarding pass and only heard about this huge delay from a fellow traveler who had been on the app to check the flight status. Very poor communication indeed from "the most on time airline" in South Africa!