incorrect pricing

My Mother and I are regular shoppers at A1 Hyper Chickens in Epping .On The 6 of Jan 2020 we did our normal shopping there round about 12pm and one of the items we shopped for was cheese. In the fridges i took out a 2.5kg block of cheese, so when we had all we needed we proceeded to the pay point. As the cashier added up all our goods she noticed the price of the cheese was incorrect and said i could have the cheese at that price as it is incorrect. I asked her to call the Manager. On arrival Mr. David Owen ( the Manager) looked at the product and said he cannot sell the cheese at that price ( R0.15 ) as it is incorrect . So i ask why not as i got it in the fridges and is it maybe a wrong label on it? He responded saying no, everything is right, it is just incorrectly priced so one of his guys marked it wrong. So I asked why can't i have the cheese at the marked price, and he said no they are protected under the consumer act and are not liable for incorrect pricing. So I took a Pic of Mr. David Owen Holding the Cheese and asked is it ok do a follow up on this and he responded with a yes ...... so my question is this :Is A1 Hyper Chickens covered under the consumer act and not held responsible for their incorrectly pricing products?