No compassion from staff and airline

While at the gate with my hand luggage watching them close the gate they refused to let me onto the flight this was 10 mins before the flight was scheduled to depart. I explained to them that this was a rebooking which cost me a additional R500 due to me missing a flight the night before due to the transport which was taking me to the airport , braking down so I had to get new transport to the airport. They still just shut the door on me and told me to go to the ticket counter while telling the pilot that he is clear to continue with his protocol for take off which was only happening 10 minutes later they only checked me out when I was back at the ticket counter the next flight available was only at 4pm ,5 and a half hours later and costed R700 more so I had to go on standby.