1 minute late horror story of indented and unaccomadating staff at Flysafair in Cape

I am complete shock at the bad service from Flysafair staff at cape Town Airport tonight (27 July 2019) in trying to find a feasible solution to the following problem I faced. Flight FA219 from Cape Town to JHB had departed at 18:35pm boarding closed at 18:20 to my understanding they allow additional 5mins before bus leaves to the aeroplane. I got to the boarding gate saw the bus leave at 18:25 and the boarding gate consultant told me I missed the flight and have to rebook. I was literally a minute late. Not aware of your systems process I had asked advise from multiple staff members and was just referred to the manager Leo who just wanted to sell me the next available ticket. I lost all my confidence in flying with Flysafair again as the staff lack decency and are unaccomadating to my 1 minute delay as the bus left at 18:24. I waited much longer than 10 minutes for my luggage to be sent back. I am a frequent flyer with Flysafair due to my line of work and wished I would've received the good service and kind cooperation as usual. I would highly appreciate if somone can get back to me urgently on this matter please.