Blackcat Peanut Snack expired(BB 28/08/15

I walked in to Pick & Pack store in centurion lake mall and bought myself a snack(Black cat peanut snack) only to find that it was expired as BB date was 28-08-2015. I checked expiry date after realizing that it does not taste as usual. I think is very dangerous as we don't know what else is expired in their shops with chickens that are imported from Brazil. I bought it today(10-09-2015)