Disrespectful casher

On Wednesday 12 July I went to Mr Price gateway. Was assisted by Thokozile [Thdla] who refuses to do my refund giving me back cash but very persistent in taking a gift card which I refused to accept and she forced me to take it saying she has no cash in her till. She also had the audacity to laugh at me talking in Zulu saying I want cash but she will give me a gift card. Thinking I am unable to understand Zulu. I expect an apology from the store manager! When I asked for the manager they called a cash desk supervisor. Is this the standards you have at your store. I find this because I'm of a different race I'm treated like this.