Very dissappointed

In July I purchased 8 tins of lucky star tins, I cant remember whether I purchased from Pick n pay or spar. I lost the receipt, recently when I opened one it looked somehow but I ignored and cooked and since then I had some funny stomach aches. On Saturday we opened one it was somehow, we opened the next until the fourth. They were rotten inside and looked somehow, I then wrote an email to them and asked for the can size, can code and best before date, car code, pictures of the contents of which were provided, only the shop details could not be provided, since I lost the receipt. Till now I am still awaiting response on the way forward or acknowledgement of receipt of my email. I kept the cans as proof of what i found inside their cans.