Barcode and price

Good day. I would never buy from clicks Morningside Glen mall. The prices on their shelves is not the same as the scanning price at the till. To make matters worse the Cashier are arguing with me and saying I have to ignore the shelf price as they only accept the till price. Then what made it worse is upon paying I apparently cannot pay with 2 different bank cards. I am totally disgusted by the service in his store. I am never going back there and never ever buying from clicks anymore. They are *******.