poor customer service

My sister bought a chips from lay's brand at a pick' n' pay store on October 17th, 2019 at festival mall in Kempton park. the chips had something brown that almost looks like a mold, she only noticed this thing as it was in her mouth, fortunately, she was able to spit it out and have a look at it.

we then took back the pack of chips with the receipt back to the pick n' pay to have them look at the mold, they called the lays chips customer care and told them my story she then spoke to Andrea from customer care and he said they were going to come and get the mold to get it tested but since then they haven't sent anyone to my house, she went to the clinic the next day because she still wasn't feeling well, to get her body checked because she had a terrible headache on the day and the following day since she had eaten the chips which means the chips are the cause of the problem because Ishe isn't a person who usually gets headaches or a stomachache.

My problem is that we haven't heard from customer care, they haven't been to my house to test the mold or even get back to my sister and ask her how she is feeling, as she is a customer who could be possibly ill from their product, it's January 2020 and no one has gotten back to us regarding this matter