Pick n Pay scan prices are more than on shelf

To whom it may concern. I had a very bad experience when I shopped at your Pick n Pay store at Graanendal Durbanville on the 22nd of January 2018. I bought 15 items and noticed that some of the prices scanned are not what the prices were on the shelfs. In total 4 out of 15 items prices were scanned incorrect with the biggest price difference being +-R10 and the others +-R 4 each. I did report it to the manager, Paulina and she blamed the packers who changed the tags and gave me one item for free. My main concern is that I checked and I have spend +-R 90 000 the last year at Pick n Pay and how many times have I paid to much. It is totally unacceptable that 4 out of 15 items being 27% of my purchase prices were incorrect. With that percentage, Pick n Pay has taken a lot of my money and everyone elses money in an ******** way. What is Pick n Pay going to do to fix this problem? I am very concerned and is definitely going to take my bussines somewhere else.