Expired items Sold - Pronutro

I made a purchase at the Epsom Downs Pick n Pay on the 25th of April 2020. One of the items purchased was Pronutro 1.5kg. I gave my kids on Sunday morning and after they consumed some, they advised me that it does not taste right. Upon checking the expiry date, I was SHOCKED to establish that the product was expired on the 10th October 2019. This is absolutely shocking to see that Pick N Pay sells expired products. My wife and I are busy checking each item we purchased to ensure if all are safe for consumption. I tried calling Pick n Pay Head office with no success. I also emailed them on Sunday the 26th of April 2020 and still no call or reply to my email raising my concerns. The item purchased was over 6 months expired. My kids have stomach aches, but I assumed, PICK n Pay gives a damn about kids consuming expired products. I tried once again this morning to contact them and still no feedback or answer. Perhaps the news will be keen on making the public aware which is my next step.