Free Airtime does not load

On Saturday the 16th of April, I went to Shoprite to buy some beers for my friends who were visiting me. Along with the receipt for the purchase the lady gave me a second slip which she said was for free airtime which came with buying the beer (R3 for every 2 bottles of Heineken 650ml bottles @ R26 for the pair) which gave me free airtime worth R9. I loaded the airtime using the code supp**** (*130*159*code#) and was told my airtime will be generated in 48 hours. So I wait and tried on Tuesday to activate it using *130*159# and all I got was a message saying the \more I top up my basket the more they top up my airtime\". I tried yesterday and today, same message.<br> <br> Why is Shoprite fooling us lie this??"