Flysafair delayed me to board and charged me extra to catch the next flight.

I was on final call to board. Flysafair staff deliberately delayed me whilst they slotted standby passengers in my spot.I could see and hear the people go down the passage.Rather than recall the standby passengers, they didn't allow me to board making me pay extra flight penalties.I reported it to customer care - Kubendra, a team manager who turned out to be a nightmare to relay and rectify my situation.They only waste peoples time, never admit fault and do not care about customers.I found that they would rather make the customer look bad than take accountability.They never rectify any unsatisfactory service ...its a ****.