Bad service

I just had the worst shopping experience at Pick n Pay Lintons Corner. I was buying dog food which was advertised at a reduced price. But they refused to let me pay the advertised price because apparently the sale had expired the previous day. The shelf had a sticker displayed of the cheaper price and it wasn't removed or indicated to have been expired. I was humiliated at the till and had my time wasted as they were trying to come up with all kinds of excuses why I couldn’t purchase the food. Wow! I was thoroughly disappointed and shocked by the service I received