False advertising and bad attitude

I was at the bakery when I saw a cherry cake marked as 'Assorted Cakes R 22.99' and a cake in the same fridge was marked at 'R22.99 per slice'. I asked the assistant if the price of the cherry cake was R22.99 and she said it must be a mistake and I should speak to the Bakery Controller. I found him in the front of the store. I told him that I would like to bring something to his attention in his cake display. Upon showing him, he adopted a nasty attitude by saying that I could think that it wasn't R 22.99 for the entire cake. A fellow shopper passed by and commented in Afrikaans, that he should be giving the cake to me at the marked price or the cake should have been cut into slices. Kelvin the Bakery controller proceeded to speak to other customers and then turn to me and showed me another cake at R43.99 and commented the cherry cake is worth over R200'. I took a picture the display and proceeded to pay for my purchases