Unacceptable service from FlySafair

We had flights booked for 23/11/2019, flight number FA264. On 22/11/2019 we did an online check-in. We arrived at the counter at 5:25, just to be informed that we are too late for our flight. There was still enough time to take in our luggage. We had to pay extra and was put on a standby flight. I have heard of a few incidents where this happened and it seems as if FlySafair over book their flights and then take the passangers who arrive first. I find this absolutely unacceptable. First time with FlySafair and definitely the last time. I will rather pay more next time to fly with another airline. Paula Meyer ***