Check your till slip after shopping here

Do yourself a favour and check your till slip after shopping at Checkers Grey Owl. I end up standing in the customer services queue for a refund nearly every time after shopping there. Mostly it's not a problem getting the refund but last week Sunday the person who was supposed to serve me gave me the wrong refund and refused to listen when I told her how much I had paid too much. I left after about 10 minutes of trying to reason with her thinking I would try again this week with another person who can do math. So this morning I went shopping there with my till slip from last week and tried again. Unfortunately for me it was the same person again and the same supervisor who with a real bad attitude said she remembers me from last week. I tried again and asked her to use a calculator this time which she really struggled to use. I gave up after another 10 minutes of trying to get her to use the calculator properly and reason with her. When I went to look for the store manager he was also nowhere to be found.