The price u see should be the price u pay. But clearly thats not how it works at OBC steeledale

Went to OBC at pick n pay steeledale today and I love their specials. I go there whenever i have money to buy. But today was different. The 6x500g ground mince had a big board up that said its r155.while the mince was still marked r165. I queried it and the guy in charge refused to give it to me for r155. He said its a mistake. The board shouldnt have been there. He walked away with the board and refused to help me. I thought the price u see is the price u pay. If that guy was in charge i dont know he doesnt know how to treat a customer in the first place and he was rude too. As if it was my fault. He didnt know what to do about the whole situation. I got so cross. Im unemployed so r10 is a lot to me. Wont buy there again. Thats for sure