Black people mistreated at shoprite

Shopprite mistreat black people at Kempton park I was at Big Shopprite, next to the airport at Kempton Park. I purchased some stuff and asked Shirley Tshabalala (the teller); she gave me a very bad experience. I ask her for R700 cashback. She said she had R600. I said, Let me go to another tiller or teller. While I was taking my stuff that I wanted to buy to her, another customer purchased it with cash. I ask her nicely, "Can you please do cashback for me?" She said I have an attitude. She did not give me cashback; she only made payments for the things I was buying. She even skipped me to assist three people who were behind me. I will escalate this to FNB Bank to let us know if we are not eligible to withdraw cashback at Shoprite. It looks like Shirley Tshabalala is doing me a favor. She does not know the brilliant basics; first, she was supposed to ask her colleagues if they have R700. She failed, which I did not have a problem with. What she needs to know is that the money that I spent at Shopprite is part of her salary. I think she's doing it because I'm black. If it were white people, she was going to treat them with respect. Thank you, SHOPPRITE, for the worst service and mistreating black customers. Keep in mind that I will escalate this to South African customer rights and other social media until it gets the attention of the Shoprite CEO.