Heritage Milk — Spoiled milk - within 30 days...Supposed to last 90 days

Address:	641004
Website:	www.heritagefoods.in

Bought heritage special toned milk last week which is supposed to be used before 90 days from date of manufacture.
Date of manufacture was on 19.09.2016. It is also mentioned that, it is to be refrigerated once opened. But when I opened the pack for use on 20.10.2016, I found that it is spoiled. To be noted that it was stored in a cool dark place.

I usually buy cavins toned milk, which I use it even after 60 - 70 days of manufacture, and I have never experienced this kind.
This experience with heritage milk was very bad, which I am very upset... It is just 30 days from the Date of manufacture, where the company claims it to be best before 90 days.