Mei Mei went shopping at Utama Shopping Mall and saw a Prodo handbag displayed on the self. The price tag for the said handbag was RM500. Because of the price, Mei Mei went to the counter to buy the handbag. However, Mail who is the casher on duty informed Mei Mei that the actual price of the handbag was RM5,000 and not RM500. Mei Mei insisted on paying only RM500 for the handbag as stated on the price tag.

Advise whether there is valid offer made by Mail in this situation. Support your answer with the provisions in Contracts Act 1950 and decided cases (if any)