Cheating customers out of money

On 25 October 2015 I visited the Kuils River branch to do some grocery shopping. Once at the till point ready to pay, the lady behind the counter was hesitant to give me my receipt. I asked her what the problem was and she mentioned that she thought she perhaps added the carrots twice. I then left the store and went home. Once home, I discovered that I was charged for products that I did not purchase. My father then called the store and spoke to a lady who advised no manager was in the store and that we should visit the store during the week to see someone. I then went back the wednesday and spoke to a supervisor who's name I can not remember but she is a coloured lady who wears specs. She then took the till slip from me and my contact details after I had explained everything to her and further she advised that she would personally call me back by end of the day as she needs to check the camera footage to see what happened the day I visisted the store. So now it has been more than two weeks and still no response from the store. THIS IS PATHETIC AND ****************!!! I feel disgusted that a renowned store would make empty promises and cheat people out of their money like this!!!