Inconvenience for consumer

I went to Pick n Pay Family Cycad to buy and saw a price on a shelf saying R25.99 and at the till it was R56.99.Well when I ask they say the description is not the same and as a customer I didn't check the description I looked at a lesser price and funny enough the R56.99 price was not there.They told me that the price you see is the price you pay is not working and as per CPA the last time I checked it was working and the other lady was shouting saying that thing is not working anymore. I took a picture of the prices on the shelf.I ended up taking something that I didn't want and even when I got home the item doesn't even work properly.