Refusing to sell specials being advertised

I have the Tiendeo app which show specials from all stores in the area that you stay. I found a special at pick n pay valid from the 30th September to 3rd October 2021 on Lean mince for R69 per kg and Lamb Braai chops for R129.99 per kg. The advert says at all pick n pay supermarkets and hypers in the North West. I sent my husband to purchase these specials however our Pick n Pay at the Crossing in Mahikeng tells us that they are not selling it for those prices. Why does the advert then say North West and they refusing to sell it to us.