Misleading advert giving woolworths bigger profits

Went to the Woolworths at the Grey Owl, the overall shopping experience was good until it came to pay. On the shelf where they keep all the Tuna, there is a sign which states \any five for R50"so I took 5 tins and when paying I asked if I got the discount and the answer was no. So the cashier goes to the shelf and says it was only for the shredded Tuna. Clearly the sign is wrong and misleading as \""any five\"" should mean any five on the shelf. I feel like I am being fooled into taking an item off the shelf and you have to read the really small print otherwise you pay the excessively high price. Basically check your slips in case Woolworths fool more of us. """