Pathetic service, rude staff and supervisors

Now its 14:50 and this flight was meant to board at 14:15 With that being said: I arrived at lanseria kulula bag drop off at 14:02 having done online check in the day before. The service staff refused to check in my bag saying that I was a few minutes late to have it done. Its 45 minutes before my flight and I was told that if I dont leave my bag behind I would have to catch the next flight after 18:00. 2 minutes late to check in my bag as opposed the flight being delayed by more than 45 minutes. Staff are unwilling to help, service desk takes forever to help, such a disappointment as I have been travelling with khulula more than 36 times in a year on business. I had to check my bag in with bid air cargo which I will have to wait for at king shaka the cost to bring that bag over was R400 nearly the price of a flight ticket. I am very sceptical about flying khulula or British airways domestically again. Flight is further delayed now. I am still waiting to leave lanseria and it is 15:05.