Amul Taaza — No froth in milk & coffee remain for more than few seconds

Address:	Amul Taza tetra pack milk
Website:	amul.com/products/amul-uhttaaza-info.php

We are buying Amul Taza 12 box of 1 litre each carton since long time (decade) but in recent purchase, tetra pack of all 12 of 1 litre carton seems problem when we try to make froth for hot milk or coffee. This has never happened in past but in recent purchase of 12 box carton and each carton in that specific box have same issue.
We are sure that there is some issue in these milk carton we bought (it could be exposure to head by distributer or something else. Please let me know if we shouldn't consume it or what is the problem with these specific box of carton