WRONG PRICE, MISLEADING BARCODE

My daughter and I purchased amongst several items a white blouse which was originally priced at R119.99. On top of the original price was a red sticker (which I have in my possess) a discounted price of R69.99. at the cashier, we noted it was further discounted to R39.99. the cashier whose name is Hope however insisted that it wasn't the price. she called the manager named Joanie who also said it wasn't correct. I asked then how come the red sticker was the there, she said the customers change the prices. I asked her if she thought we changed it, she asked loud and rudely, \did you".. this woman didn't respect us and made us feel like *******.. why is Mr Price stores not checking their price tags and misleading the customers. why is the store staff rude. as for the cashier"