Portia T

I bought a whole chicken from Pick 'n Pay Waterfront for my kids. They got sick and started vomiting and complaining about stomach cramps after consuming the chicken. I noticed that the symptoms are persisting and took them to Children's hospital where we spent about four hours. I took the chicken back and spoken to a customer service manager who promised that they will pay for medical bills if there are any and I should also send them the invoice for transport. she also promised to give me a call to check on my children the following day, however she didn't ask anything about the kids when she called. She just told me that their lady said I do not have a case. They got it wrong as I was not after money, all I needed was a written apology. However I was treated otherwise. Please advise, what steps should I take in this matter.