Won’t honor a product for the price I bought it for!

Today I purchased a Samsung tv online , the price was displayed as R19999. I placed the order and even received an order confirmation. I then go to the store to collect my tv and make the payment as I had selected to pay in store and selected a store that had stock. When I get to the till I am told to wait as they call the manager, the manager confirms my order and the pricing but says they can’t sell it to me for the price I bought it for and they are selling it for much more . Is an order not binding once I have received an order confirmation? What means did Hi Fi Corp try to contact me to relay that there was an error? The terms and conditions say that a sale is deemed as completed once and order confirmation is received. Can some please contact me and explain why consumers must be misled , buy things just to be told the price was changed after the fact , I drove to the store just to be told this , done my time and money mean nothing .I would like for Hi fi Corp to honor their sale as they made no efforts to tell me that there was an error and are blatantly false advertising and leading people astray .