Hard Kellogg's Flakes

My husband bought the 750g of Kelloggs KE Festive Nine 9 in this week at Spar. I opened it this morning and the flakes is hard, its not light and crispy, it takes 30 minutes to get soft, my son do not want to eat it and I'm not satisfied with the standard of this box of Kellogs. <br> <br> Below are the box details:<br> ?Barcode: ***<br> Production: 31/12/14 00:30