Expired/ contaminated cheese

i bought c***** slice cheese at pick n pay. my family has consumed some of the cheese without realizing it has expired or rotten. as a result, we became sick i consulted a doctor and i had to give my kids activated charcoal. upon inspecting the product, the expiration date is 3 May 2023 and manufacture day is 6 august 2024. so how do the item expire before the manufacture day. I've sent emails (7Dec) to c***** with the picture of the product which was ignored.