False advertising

I attempted to purchase the Quality street as advertised in there festive low prices leaflet that is that is valid from 24 November to 25 December 2015. It states that only one voucher per smart shopper customer is available and then you can purchase the sweets at R39,90 instead of R59.90. No voucher was available at the kiosk nor was the R20,00 taken off at the till. I did not purchase the product as I want it at the R39,90 as advertised. This is clearly false and misleading advertising on there behalf. I wonder how many other customers was also mislead in this way. This is not the way customers should be treated.