Pearl said she doesnt give a ****

I went to Pick n Pay Alberton, Lemon tree yesterday and at about 14:45 I was at the till to pay and I was assisted by Pearl. When she handed me my receipt and change , I noticed that there was a shortage of R50. I then told her that I gave her R200 and not R150 that stated on the slip. She said she doesn't want to get a shortage and will have to view the camera to confirm. She still continued to assist 2 customers that were behind me . That didn't make sense to me because I expected her to handle my situation as a priority because I knew that she was at fault. After assisting the 2 customers she went to view footage and I had to wait for about another 5 minutes. Upon her return she acknowledged that I did indeed give her R200 and she apologised with an attitude. When I asked her why she was giving me attitude she said I'm the one that gave her attitude in the beginning when she asked me to forward a trolley. That concluded that it wasn't a mistake but she was just being spiteful. Her arrogance and bad attitude got to me I told her that I'm going to report her bad service on Hello peter she said she doesn't give a ****. Pearl needs to be taught manners and how to speak to customers