Horrible experience with supervisor and manager

I ask the guy unpacking the liqour to get me a price on a 6 pack cans of Belgravia gin and dark cherry. He went to ask the lady at the till and said it is R95-00. I took a 6 pack and went to pay. At the till the lady scan the barcode ( on the printed barcode the prize was R95-00 ). The computer then show a message " warning this is the cost price " . The supervisor told me that the price should be R135-00. I told her that I made double sure of the price and she must give it to me on the price as seen on the barcode. She then phone someone and let me stand there without an explanation. After about 5 minutes an lady come and said to me " I know you " I rep**** yes because I have been a customer there since they opened the store. I explain everything again and she refused blatanly to sell the liqour to me for that price. She said they are busy putting the right price on the computer. When I ask them why the till lady have a barcode pricelist saying it is R95 , they couldn't answer me. They refuse to help me and I left the store. Hort