7/11 in despatch poisoning its customers

I have been a regular customer of seven eleven in despatch for more than two years and in those two years i have had a lot of food related health problems like nausea after eating diarrhea to mention the worst. After i started becoming sick more often i started inspecting the foods expiry dates as i bought them from any shop and when the latest incendent happend on the 20 of december 2015 i decided to post this complaint as it was expired foods that had been causing my problems. I have checked most of the food items in the 7/11 shop and well most of the items are expired with new stock at the front and the expired right behind new stock but what really gets me is the fact that they sell the expired food items they know about at discount advertised as you walk in the shop. I walked up to the till once to pay and looked at a item on display at the till a chip and dip and it had been expired for more than 5 monts im sure that item is still on display the sales lady watched me as i checked the expiry date i put it back and a month later it was still there. The owner should be ashamed. If anybody reads this check your expiry dates and if possible report them to the health department.