Incorrect booking by system and terrible attitude!

After booking a flight online to Cape Town where I specifically made very sure of the flight time (as it was incredibly important to be on time!) I received a check-in confirmation via email by the time I got to the airport. The confirmation stated that I was booked on the later flight, despite my concerted effort to ensure the earlier one. I approached he ticket sales booth where one employer said she was \offline\" when her computer was simply off. The other approached with such an unwilling attitude and eventually simply pointed at the check-in counter and said only they can help. I then approached the check-in person who simply outright told me it was my fault and she was not willing to do a flight change (even after I stated that I would be willing to pay for the change even though it was not my fault!). Two managers then approached and were EXTREMELY rude about the situation, simply telling me I better get on the later flight or not get on at all. All this despite me being well in time for the earlier flight and being willing to pay for a flight change that was no fault of my own. Terrible service like this is clearly why these new small airlines don't survive in SA."