Worms in the Maize meal, DISGUSTED!

I went to Checkers Southgate mall yesterday to purchase groceries. I opened up the maize meal I purchased, only to find a bunch of worms in it when I was about to cook it. The expiry date was on the 16th of December and they still have these things right in front on their shelves. Obviously when you go shopping it doesn't cross your mind to constantly check the expiry date for every product you purchase therefore it is the stores responsibility to ensure that products are in perfect condition or not passed the expiry date before a consumer purchases it, which they clearly Failed at doing.. I honestly didn't expect such from them but that was last time shopping with Checkers!