Please be clear!!!

This afternoon I went into Dischem at the Pavilion Mall. They had quite a few good specials so I picked some of them up. One was simba chips, it was 3 packets for R36. So I picked up Simba Lays, cheddar and beef chips, when I was going to pay they tell me the lays are not part of the special. DISCHEM!!!!! Simba chips are Simba chips whether they are lays or not!!! The advert said Simba chips, it did not say except Lays. I was so irritated by the attitude of the tellers and supervises that in the end after about twenty minutes I actually didn't buy anything from Dischem because they then wanted to take everything off and put it through from the beginning again because there were other things on special. Why they couldn't just void the chips I don't know. The process is dumb and not logical. Please Dischem teach your tellers how to do things properly and advertise correctly!!!