Wrong prices in shelves

<p>I really don' t get how this price change works esp at Shoprite . went there to buy some few staff, normally I'd buy 2lt cooking oil for R36.99but saw a special of R59.99 for 5lt Helios. I then decided it would be best to take 5lt. Went to the till , had a few items so didn't take much notice when they were scanned. When i got home, checked my slip and boom**** Cooking oil R93.99 . When will i get to go back to Shoprite Montlair???? I'm disappointed!!</p>