Wrong price put by workers at pep

Good day.I went to Pep store in Carlton center around 16:30 today and wanted to buy reading glasses.I saw the price of R59 ,99 and upon paying they told me that they are R69,99,now I don't understand it because I found them with the wrong price so how is it my fault.They refused to give them with that price and I am truly angry 😡😡😡. This is not how you treat a customer...