Product Advertised Incorrectly

<p>I was at Total Garage Mooikloof this morning 14.12.2016, I took a product Fisherman's Friend off the shelf which with a price at the bottom R20.50, when the teller rang the item up it was R40.50, which i refused to pay as it was on the shelve for R20.50, whereby the supervisor refused to assist and said i can take it further if i feel when i said i will take this further, the teller even said to him a customer pays for what it says on the shelves! This is terrible service!!!!</p>