Disrespected and sold wrong product for wrong pric

I was in store on Tuesday 8 March and saw a display in store for a gopro with a price of R2200 odd but no product on display. No sales consultants around to help either. A lady walked past and I asked her to send me help she said could try assist. I said I want to see what gopro is being sold at this price so she went and fetched the gopro and handed it to me I asked about the product and then codified over and over with her that this was the correct product being advertised for the price on the display. She assured me it was and I could ask for her the next day when I come purchase the product. I walked away still not 100% sure and went back to the display. This time a sales consultant walked past and I confirmed the same thing with him and he assured me 100% that is the product for that price. Next day I come in store to purchase and low and behold it was the incorrect product and they refuse to give it to me. I was sold the higher model for the R2200. Staff have no idea what they talking about sold me a product for the wrong price and now argue with me won't give me the product. Managers treated me like I'm the one at fault and defending their *********** staff!!! I want resolve