Bad Service

I went into the store all excited and happy but came back with so much disappointment from the cashier Thato. I bought stuff and asked Thato to give me a cash back as well. I have never had any challenge with receiving a cash back at any PEP store. Thato agreed to give me the cash back and she even asked the amount, I confirmed the amount. When she gave me a receipt, I asked where is the cash back. She just said oh I forgot, no apology, nothing. I asked her what should happen now because I have already bought and asked for cash back and now you saying you forgot. She forgot because she was not paying attention, speaking to her colleague about knocking off. The customer next to me asked her that you made the mistake and you forgot, can't you give her the cash back. She just said no, she would need to purchase and start the queue. She never bothered to apologies regardless of how much , I and the next customer told her how imvonveniecing this is. Thato just moved on with her life as if nothing happened. I left the shop a very unhappy person with my 6 year old cos she also heard me asking for the cash back. Thato was rude and unprofessional in the way that she handled the whole incident, the never mind attitude did not display any customer service etiquette. I am disappointed. PEP PTA North