Cancelled flight with no care

Flight from Cape Town to Auckland

Once we had already boarded our flight Sitting in the plane on the runway for over 1hr with no communication, only after the hour of all of us getting frustrated we were informed there is a technical issue After another at least 20 minutes we were told it’s a major issue and we need to disembark and go to the restaurant Another 2 hours of no communication we were told the flight is cancelled and they will inform us of when we will fly (a possibility of not even the next day as the next day flight was already full) I had to get to Auckland for Ironman world championships And with the amount of money I had spent on getting to this once on a lifetime event, I was an emotional wreck, the only thing the airline helped with in the end was putting me into a Turkish flight which added 12 hours extra to my travelling time who h meant I would still miss the event registration and not able to race. Singapore sent a voucher of apology. That is hardly worth the emotional trauma I went through AND missing out on two tours I had already booked and paid for!!!! I am now not getting any further updates from Singapore while I am simply requesting my Next flight back to South Africa be upgraded to economy premium It’s actually unacceptable