Sold expired food and still selling expired food

I bought 5kg goldi braaipack at pnp reyno ridge on the 13th of April 2019.....cooked it once we,thought the smell was something else, kids started getting stomach aches, cooked it again without noticing, kids still having stomach bugs....check the the pack found it had expired on 11/03/2019. Went to talk to them, check their freezer found all the packs had expired, the only thing they can help me with is refund.....what about the ordeal I'm going through right now? I have proof of the receipt of refund, and pictures of the packs in the freezer. And I did not see a "buy at your own risk" sign.