woolworths always out of stock

Hi <br> <br> I visited two of the woolworths store's earlier today woodbrigde and the festival mall branch looking for the long life milk that was advertised 6x1lt for R49.99 just to find out there is no more stock they said that their still waiting for the DC to send them some stock and the couldn't even get me one case so now I wonder why do they advertis these products till sonday if they dont even have enough stock to help there customers with 1 case of milk what bad experience of shopping at these stores