Gokul Milk — gokul milk spoiled

I purchased 2 litres of gokul buffalo milk on 5 jul 2020 from vendor near my home. I kept the milk for boiling 1st 500 ml it got spoiled. 2nd time in another vessel i kept another 500 ml for boiling it again got spoiled. 3rd time i tried full 1 liter in 3rd vessel and it also got spoiled.

This has happened almost 10 times in last 2 months that the milk has spoiled.

When i asked for replacement for the same yesterday, the vendor only provided 1 ltr replacement and for other 1 ltr vendor is asking to call customer care to get the replacement.

When i tried to reach customer care pune. The cell is switched off.

Please let me know how can i get the replacement for remaining 1 ltr from vendor.