Bad taste

dear PnP. are you serious!!! we do our monthly shopping at your store - spending a few thousand rand there EVERY MONTH. we did grocery shopping in April - bought 3 x 6packs PnP long life milk. we used the milk we had first, then started drinking the PnP milk. EEEEUW!! has a horrible after taste. tried to use in food, still horrible taste. tried making yoghurt, even worse. I do not have the slip any more, also not the 6 pack packaging. i sent a mail, explaining that the milk is really bad, mentioned that i do not have the receipt and also not sure which shop i went to, asked if you can look on the loyalty card history. get a reply, please reply with all kinds of details including receipt. again i rep**** that i do not have the receipt, but this is a PnP branded product. ticket was sent to a different department. i am very generously given R17 back on my loyalty card in points and can i please take the receipt and the milk back to the store where i bought the milk. PnP i do not have the receipt - usually not needing these for grocery items. so yes, that is my mistake. BUT. this is a PnP brand milk, way before expiry date and tastes horrible. i cannot even donate this, as this will be thrown away. so please, advise on a way forward, and again I DO NOT HAVE THE RECEIPT, SO PLEASE STOP SUGGESTING RESOLUTION THAT WILL INCLUDE ME TAKING THE SLIP TO THE SHOP I BOUGHT FROM. I AM ALSO NOT SURE WHICH SHOP I BOUGHT THE MILK FROM. WE HAVE 2 SHOPS WE USE.