Clicks overcharging(Buy 3 and pay for 2 is a lie)

This is not the first time Clicks Sasolburg has been sly. The first time I payed for batteries and it was on my slip but when I got home it was not in my bag. Then I left it as maybe it was a mistake. Then the second time I bought Gorgeous spray the price on the shelf showed R28.00 but after I payed I checked my slip and it was actually R 35.00. Also I left it as I might have been wrong but today was the last time I will buy from Clicks as this is the worst.

Today I bought Xilitol 1KG packs, the shelf shows 2 for R 150 each as one was R 209.00. So I took 2 and on my slip I payed R 169.00 each instead of R 150.00 each as displayed. Also there was a special on Clicks Revive body wash, pay for 2 and get 3. On my slip I payed the amount of R36.99 x 3 and at the bottom of the slip -R15.98 for Revive. Now my calculations are I pay for 2 witch will be R 36.99 x 2 = R 73.98 but instead I payed R110.97 - R 15.98 = R94.99. Then I specifically checked the price for the Yardley Gorgeous, it showed on the shelf R 28.99 and again at the till I payed R 36.99.

So in total clicks overcharged me with R 67.00. I am very unhappy about this and usually I never check these prices to the specials afterwards because I trusted Clicks but since I have been double checking I have seen how much they overcharge and how much have they been taking over the years? This is horrible!!