Rotten energy bar... Poor customer service

I bought an energy bar and it was rotten and it had flies inside , when I returned it to the store I was treated like I made the bar expire or it was my fault...I expected an apology from them instead they said it’s not their fault it’s the factory fault that the bar had crocoches and webs plus i found it unsealed when I got to work... I’m not really mad that the bar was rotten and all that but I’m ****ed because of the way things were handled and noone accounted but they kept on tell me its the supply but at that moment they are my supplier for that bar like really... their Customer service sucks and I buy there everyday .... They just gave me the R 6 and left me there standing like a fool...