Unpleasant experience at Ackermans Greenstone

We had an unpleasant experience at Ackermans Greenstone yesterday, 13 June 2021. My aunt saw sneakers at the store that she really liked and fortunately they were marked down to R109 - a price she was very happy to pay! When she got to the cashiers, they informed her that the shoe was not marked down and asked us to bring one that was marked down, and we gladly obliged. The pair that I brought was also marked down, though a different size. The cashier then called a female manager who was not very understanding of the fact that the customer has the right to pay the price they see on the shelf and that it is not the customer's fault that the item was incorrectly marked. My aunt really liked the shoe and she paid the price but I felt that we were treated unfairly by the store. As a regular customer of Ackermans, I am very disappointed with the treatment and I will definitely not be recommending Ackermans Greenstone to any of my family and friends! ???