unhappy customer

I have been renting with Avis Car Hire at Cape Town International for many years. I was utterly disappointed on Friday, 14 September 2018. Not only was I left sitting waiting for a specific vehicle which I had booked for over an hour, but, the manager on duty was less than polite and just insisted that I take the vehicle which was available at the time. The manager, a certain Ms Anneline Kanza had no time in providing customer satisfaction. She merely wanted me to take what was available. Surely, if I'm paying for a certain type of vehicle and its advertised by Avis, then surely I have a right to request one. Or am I missing the point? When first arriving at the counter she made it a point of telling her colleague to make sure she deducted enough holding deposit. Which is what Avis normally does. Such emphasis was made by Ms Kanza about the deposit that it turned a few heads at the time. I found it most pecu****. I shall ask Ms Kanza the question, is it because I am not white enough or am I not black enough as I saw no problems with the rest of the customers while I was there. I love renting from Avis as I find their staff usually on the ball, polite and well trained. But something went wrong with Ms Kanza or perhaps it was just with me?