Pick 'n Pay *****s your money

I am so tired of items prices being miss marked in store. I did a full grocery shop at Pick 'n Pay Hypermarket Port Elizabeth today. Between having to search for prices as they were not displayed on the shelf I then ran out of time and was in a rush when paying. I luckily noticed that my cucumbers scanned incorrectly at the till. I brought this to the cashiers attention. After seeming rather irritated with me he called someone to help. I then had to walk her to the cucumbers!!!! The price was changed and I paid the R9. 99 as it was on the shelf and not the R12. 99 that it scanned at the till. When I got home and had some time I went through my slip. I then noticed that a 2kg bag of red onions that I bought scanned incorrectly! The shelf price was R39. 99 and it scanned R49. 99. I am beyond irrited as I go to the effort to find the cheapest option!!!!! How am I supposed to unpack my full trolley and check the price is being scanned correctly and make sure my groceries are being packed so that nothing is flattened or damaged?! Pick 'n Pays prices aren't cheap... And then definitely not cheap when I am over charged!!!!