Poor policy implementation

I bought a pack of Vienna’s that had a sticker on there for R37.99. I paid for my things and checked my slip and saw that I had been overcharged. I immediately went back and a lady took me to customer care. According to Woolworths policy if an item is incorrectly priced or scans a different price to what is advertised, the product is free. The customer care consultant just cancelled the sale of R52.99 and changed it to R37.99. Does the policy not stare the first item will be free. This was not the case at Mall d the South last week.