Expired Biltong

I did my month end shopping on Saturday at Rosemall Mall PNP, my family selected PNP Biltong which was consumed until I checked the expiry date and the biltong was expired (09 June 2015). We all had running stomachs. My 7 year daughter consumed this biltong. My husband had stomach ****s and sides ****s after consuming this biltong. My 70 year old mother had running stomach and myself included still have running stomachs. Not once did I ever think it was the biltong that was causing all this drama until I checked the date. I mean this is a health hazard. How can PNP sell expired food?