FlySafair denying my flight

On Friday I rushed from Queenstown and drove 2 hours. I got to East London when there was load shedding. I still drove like a maniac trying to get there on time. I got to the front desk at 17:17pm. I was refused my flight because the front desk told me that they closed check in at 17:17pm. At this time, the plane just landed at 17:10pm and people weren't even disembarking as yet. I wasn't alone, I was with colleagues too. 4 other colleagues. Two of my colleagues checked in online and they didn't even want to check in their bags too. Security told them that if they want to get onto the flight that they should leave their bags behind. The two of us that was denied our flights completely took our colleagues bags who have checked in online. It took 50min for that flight to leave EL to JNB. I spoken to management telling them if they could please assist by checking us in and we where denied. The manager on duty was Ballard Nleya and his staff denied us our flight after explaining to him that I am a single parent and have full custody over two kids that would be at home all alone because my flight was denied. I had to purchase new tickets under booking reference numbers 72N8I5 and invoice number *** and JN4DHC and invoice number *** which costed R1670.50 including adding 2 additional bags I had to pay for because my other colleagues was forced to leave their bags with me. Including that, more added expenses came from my pocket because I had to pay for one night accommodation at R800 and uber costs back and forth to the airport costing R140. Now, Saturday came when I had to fly back home at the same flight time due to FlySaFair denying my flight on the 5th Nov. So I get to the airport on the 5th Nov 2021 two hours earlier just so I don't experience the same. I checked in and I waited after clearing customs. The plane landed the exact same time like on the 5th Nov 2021. I recorded exactly what happened. The plane landed on the 5th at 17:10pm. People disembarked at 17:20pm, the gate opened at 17:40pm for us to embark the flight. I have recordings that people was still coming into customs at 17:40pm. Now, customs and the boarding gate is not far at all from the front desk of FlySAFair check in point, which tells me that they cleared after 17:15pm at check in, so what was the actual problem why I was denied check in and my flight on the 5th Nov 2021 at the exact time? This is unfair and I felt ****** by FlySaFair. Not only me, but my colleagues too.