Incorrect prices on the tills and Manager who refused to come to the customer

I went to Food *****s Kenilworth for my shopping. I bought carb smart which was R32. 99 and heba which was R39.99. So when I was finished paying I realized that they charged me R44. 99 for the spice and 42. 99 for Heba. Now those price are not even on the shelves prices.

So now I asked where is the customer service a lady came and she said I just need to wait she need to help out another customer. She came back, we went to to the shelve and she also checked that the till price was incorrect, now we have to go back to the till. She said she will give me the difference and ask her what is their policy because at Pick n Pay, you get that item free. She said their policy is that they give you the difference. I say to her how is effective is this policy in terms of ensuring that the staff strives to eliminate errors. When in all cases the company does not lose anything but this is an inconvience the customer. She said I making sense, she will call the manager, my till slip says that I paid at 12:30 and 12:55 still there was no sign of the manager, they just sent the lady to say unfortunately that is their policy and Pick n Pay has theirs. I was disgusted to say the list. The Manager name who could not come after being called to come down more than 5 times is Christspin.The fact that they had prices that were not not even on their items on the shelves is shocking. So there are propably people that are overcharged.