Customer service

I fly buisness class and only use SAA, I have had previous issues but this one take s the cake. Booked in on time arrived on time only to be told by ticket clerk I'm late and she won't put my luggage through? Note she tells me that there are only 15 people on flight.... I then re-book the next flight with my buisness card and they preceeding to tell me they can't use my buisness card! I've used it many times at this airport prior? I go to SAFAIR, pricing 4 x less!? Even for a late booking and one way. Polite and accepted the same rejected card? I have been delayed many a time with various airlines and plenty with SAA. As a customer never recieved an apology or a reduced booking on next flight. Our businesses spend a fair amount weekly with SAA local and internationally and I can most defiantly say we will not continue to support \proudly South African airways"not amused."""