Bad attitude towards customers

I just received a bad and shocking experience at Europar car rentals at King Shaka International Airport where we booked a group B car- VW Polo Vivo and we were given the Ford Figo and we couldn't accept the car as the boot was too small for our luggage. We could see lots of VW polo cars and we went back to Kegan to ask for the VW Polo we booked and he refused to change the car. He kept on emphasizing that we booked a polo or similar car. I found the experience as ****** and bias because a white lady complained that she got a Chevy spark and they gladly changed it for her and he refused point blank to swap the cars. He was unapologetic and very rude and my husband always books cars from Europar cars and this is poor service. I will take my money where I will be given proper service