Watch out for the Clicks 3 for 2 special

Was so disgusted today again to find how sly Clicks SA is with their so called "specials" . This was the second time I bought at their 3 for 2 special, so they would mark a product as ex R20 but when they scan it it scans as ex R26, so if you dont check your slip you will never even know if they over charged for some products, so you think you get the 3rd product free but actually you pay for it. Both times they had to pay me about R20 back, I am sure they catch a lot of people like that.