Shoprite false advertise and voiding Customers purchasing rights

I went to Shoprite Greenacres, Port Elizabeth today for their advertised Sunfoil Sunflower oil 4L for R49.99 with intention there is no limit quantity as it does not clearly indicate. The advert displays as like 3 sections, the section that the oil was advertised in does not show limited quantity. When approached the store wanting to buy more than 2 quantities the Manager and teller insisted that only 2 quantity is allowed per customer, but there was no quantity limit for oil advertised. The other section of the advert shows 3 quantity per customer. When I showed them their advert the Manager denied what's stated on the advert and instructed all tellers that only 2 quantities per customer. There is a clear false adverting and method of luring customers to Shoprite Greenacres when the store's intention is not as advertised. This thus is in breach of the Consumer Protection Act in terms of advertising and customers right to purchase as what was advertise.