Price wrong marked - Consumer Complaint for Clicks Store - Head Office

I bought a product at clicks Waverley it was marked at R170 on the shelf when I got at till the price was R329. The staff made me pay the R329 after I said to them the price marked on shelf was R170. They did say that is was their mistake what happend to the price I see is the price I pay?? Unfortunately I could not take a photo of price as staff refused and changed price immediately. And that is wrong for me as well