Adulterated nandini milk

In the past one week nandhini(kmf) milk I brought from the vendor has broken (adulterated), hence I am raising this complaint. Yesterday evening I bought 1 ltr (2 half ltr) milk from the nandini milk point. Just after going home it broke (adulterated). This has happened quiet a few times with the same milk point in the past. This milk point charges more than mrp and says it is for keeping the milk in the fridge and nandini dairy only instructed them to charge extra. Please look into this and let me know what needs to be done if I get broken milk next time. Regards shirish