Rotten products sold in store

I bought Golden Cloud Flour from your branch in Cornubia mall on the 26th of April 2015,unfortunately i dont have the receipt anymore however i bought it via Pay Just Now, the flour has worms in it and worm eggs,i opened it today ,the expire date on the flour is 25 July 2025 i dont understand how you guys sell us as your clients products that are not good for consumsion, last month the bell peppers, sweet corn and the mashrooms were off i only realised when i wanted to use them