Misleading prices

Over the last few months I have been to Clicks many times and on almost all occasions their prices are priced at one price on the shelves and at the till I was charged a much higher price. On the 3rd time this had happened I did bring it up with the store manager where this discrepancy took place on that day however this seems to be a common practice across all clicks stores as this has now happened at two other stores I have been too. We often take it for granted when shopping we are going to be charged at the till what the item is marked at on the shelves, however some of the products I have purchased were being scanned for almost R10 per an item more. Note this is not the pricing difference due to the Vat increase as the 1st incident happened months before the new Vat rate was due to be implemented, as well as the prices difference was much greater that the VAT increase would be. I am shocked that staff and managers at click stores are now so accustomed to this happening that they often dont think they need to let the customer know what is going on. The staff seem to know about these price discrepancies however customers are not told by means of a notice that their prices are inconsistent, and we are only told after we ourselves notice that we are being charged more that the matter is then addressed. I frequent Clicks stores often but due to this, what seems to be a constant issue I now avoid going in as recently I feel ****** every time I have been in a Clicks store. The first incident was the 250ml Oh so heavenly handwash liquid of which I purchased 2, marked at R17,99 at the till I was charged R23 some change. On the next occasion at a different store, I purchased the travel size Hask shampoo and conditioner marked at R54 at the till it was scanned for more than R60 of which I brought to cashiers attention and he verified this was indeed being scanned at a different price. Then again this occurred when I bought wet wipes and then again with epimax lotion. I really feel this is very unfair to the consumer.