Unfair

I went to pick n pay eastrand mall to buy S26( ready to feed) for my son who was 6 months at that time. The milk was thick inside I only realized after giving him 3 of the 200ml, went back to pick n pay to return the milk and told them I need to take my son to the Dr to check if he is not affected as he had rush and was vomiting, they told me I need to pay that myself first and after investigations which will be done by the supplier then they will see if they need to compensate me. This whole ordeal happened towards the the end of may, pick pay manager Dorcus communicated with throughout and told me the matter is with the supplier, I got a call from Elizabeth Langa who asked me for lab test that proves that the rash and vomiting was caused by the milk, I told her the Dr just physically examined him and she wrote a letter to say we indeed brought him for check-up. They told me to wait for 21 working days for the their investigation, I waited for longer than that also had to write them another email for them to send me a letter saying there was nothing wrong with their milk. But here Is my argument, I had to take my son for that checked up unplanned I spent R2000 on both consultation and meds, the manager at Eastrand and the customer care cashier saw the thickness that I was talking about but the supplier comes back and say there couldn't find the thickness and also they can't refund me my money, for me this is totally unfair☹️