5 second rule of woolworths

Hi all so today i went into woolworths promanade for the chicken special of R170 for 2 though the qeue was long the girl helping at the deli was very friendly ..her service was amazing she should actually get a 5star for her service.let me get to the point i got to the till my fault i did not know about the rewards card so now im asking the cashier about it coz she state she can't help me if i dnt have one i ask the customer after me to borrower hers bt getting back with the card the cashier said she used hers i said ok explain to me what I have to do to get 1 she said they dnt have....they out of stock?anyway i added a salad bt i did not even leave the store then I decided i dnt want the salad so i went to the returns till just for them to tell me about 5 second rule im like what is that I've been working in retail for nearly 10 years ive never heard about that rule i ask them to explain it to me and i was told by the manager that its the company's policy....if it's the company's policy why is it not on the back of the tillslip like all the other return policy on their tillslip.so I paed r70 for the salad what if im not happy with it or ive changed my mind on the flavour or if its not fresh....i can't exchange it because woolworths has a five second rule? I hope someone can explain this to me cause I really need clarity