Incorrect discount and rude service

Yesterday I bought groceries from Checkers Arcon Park. I took items that was on special. The queues were long and when I eventually go to the till point I saw my total was higher than expected. I paid and left as I was already in the store for so long and I have a little baby waiting in the car with my husband. When we got home I checked my slip and saw that some of the items rang up for more than advertised on the shelve. R11 per item, to my surprise there were multiple items that had this mistake on. On most items the discount didn't deduct correctly, this wasn't R1 or R2. R20 on one item, R30 on another.

I went back today to inform them of the mistake. I had to put all the items that had the wrong discount on in a trolley as if I am purchasing them because I didn't take my items back and go back to the till at customer service. Theresa the manager tried to calculate manually working through the pamphlet , thereafter she told the cashier to do a refund, the till didn't have enough money and they had to put money in the till. Thereafter they rang up the items and did a refund then rang up everything again. She told me the difference was R12 which was not correct. Theresa saw that I was getting frustrated and told me to keep my pants on. I wasn't rude throughout the situation. I eventually asked how long it was going to take (This was almost 1 hour 30min later) and Theresa told me it will take as long as it takes. They don't understand the system, make customers wait, are rude... I mean, where does a manager tell a customer to keep their pants on!!??

I asked her to do the rectification and I will go back to get my money when I can or ask my husband to go as I had my children with me and my baby had a dirty diaper and I can't wait for as long as it will take for them to figure it out.

She needs training!! Not just on the systwm but on people skills.

How many people pays more without realising it because the system doesn't deduct the discounts correctly and when did it become okay to be bluntly rude??

The cashier wasn't rude, she was trying to help but no one seems to understand the system.

Checkers Arcon Park, I am really disappointed!!!

The only reason I went into the store is to qualify for the 10% in store discount that they advertise you get when you are subscribed for the monthly 60/60 delivery services.

What does it help getting the 10% off but paying more than the amount on the shelve. Then that is false advertising. You actually don't get any discount and just waiste your time going to the store!