When a HOD doesn't know about customer rights???

Last night I was in store,my 2yr son & 3yr daughter wanted a new pool,I was very hesitant due to us owning a 3.05m pool that's never used,the pool that they wanted for R349 was discounted & had an A4 page over it stating that that pool was discounted,I still felt that it was overpriced for R349,I called the guy that was working in that isle to assist cos I needed to knw how much water it required in which he took out the box checked it & put it back in the same place,it was definitely not packed in the wrong shelf due to it fitting exactly & packed neatly but when we got to the till it scanned as R599.The HOD Suren Manor was there & saw that whatever I said was true & saw that the A4 page discount was for that pool bt refused to give it for the price or check if it was discounted & maybe the system was not yet updated.When I asked him to tell my kids that they can't have the pool that they were excited about,he just smiled.Now I'm sitting with my kids keep asking me were's that pool due to me promising them thinking i was definitely getting it for them.i called the store today(08:00),spoke to one of the managers & was told that the branch manager will call me back but still no call