Faulsly advertised

Hi 10 june 2023 around 8:30 pm i have been to the bp express joyhurst street... I saw baby infacare with all the boxes price tags R44.99 i confirmed with the guard he said yes thats the prices on the box... So i went to the cashier purchasin one . but she said its an error or mistake and she cant give me at that price. So i asked whats abt customerss ryt.. Url got it advertised for that price.. It should be given to me at the price url faulsly advertised for....but she refused.. And removed all stickers..... But me as a customer feels that is not fair.. Url are the first shop to faulsly advertise and not give the customer for the price stated....