Poor customer service.

On 10 October I bought two items at the Hauwei store at Rustenburg mall. On 12 October I returned one item as I realised the other item contain the same item I bought. When I was at the store the was a lady who gave me so much attitude and told me that they would not take the item since it is not hauwei branded. I told them I have the right to return the product as per consumer protection act. The lady with an attitude tells me that I cannot buy and return the product knowing I do not need it. I was met with so much hostility. Another lady came back to assist, she looked at the item and said I had opened it. I told her I did not(I really did not). We argued and I told to please refund me cause going back and forth does not assist. She told me because of how the package looks they will deduct 20%. I am so unhappy. It was my first time buying at hauwei and that was the last time.