Bad attitude and poor customer service

I went to Spar in Johannesburg bree with my friend to get a few things. We took everything and then the spar grillers which were written R29.99 but when we got to the cashier they charged R39.99. We queried why it is now that much and the cashier said unfortunately we will have to take it as she has charged it and they are not allowed to do refunds. We asked her to get a second opinion and then she called Mogkadi who had a very bad attitude for someone who work with people on a daily basis. She said she was going to check the price and did she go? She was walking very slow while busy on her phone and we had to wait, she took forever and finally she came back and she said\ you looked at a wrong price and we can't refund you because you used a debit card". I told her that is not a debit card but a chip card and a refund can be processed successfully. She gave us a very bad attitude and I asked if she can call her manager and we sort the issue with her/him. The lad came and she told her we want and refund which is very impossible to get as their system does not allow it. Which system doers not allow a refund? From which bank? They finally gave us the refund but the attitude sucks."""