Pick n Pay - Treated unfairly

On the shelf they is a price of R20.00 ... and when I come on the till they say the price for the baking powder is R56.49 and when I tell them that the price is written R20.00 they tell me I moved that item from the shelf and put it somewhere else and put it on the price I ask them to show me the camera the refuse to show me I took my money back and this is what the manager issic and the supervisor Irin told me ....this is the store from trade rout mall