Maggots in Spar food

Yester I went to Roodeplaat Spar and bought some items as this is the closest place to my residence. I purchased a cheese and Vienna roll pack. When I got home, I took the cheese and Vienna rolls out of the Spar packet to eat. As I looked at the Vienna on the roll, I saw maggots. Looking at the entire roll pack, there were maggots all over inside and on the food and the pack was not past expiry date.