Wrong pricing

I went to buy the microwave at Game Stores in Tygervalley Shopping mall. They have the microwave stores at a shelf and pricing R1399 on more than one places when paying for it I was told it's R1899 my question to them why was it priced R1399 I was told I should read that price is for a different microwave. From what I know it's customers right to get the product at the price because it's not my fault that they stored wrong products on wrong prices. We had an argument with the old man that was assisting me and I ended up paying the R1899 BUT that's wrong.