Poor customer service level and not understanding the importance of a customer.

I am shuttered with disbelieve of the level of service I received from Nokolo Zulu, at one of the pick n pay retail store in Birch Acres. I asked her to please give me cash back for R250.00 she responded without a gesture of showing customer care she ordered me to do my packing, with a harsh voice that she doesn't have then asked her to check with her colleagues who has the cash back I am asking for... the cashier behind her she was also rude and I converse with her using my native language which is "Venda" she never had any remorse to help me. I really don't understand why a big retail like Pick n Pay doesn't have packers more especially during times of month end.