Amul / Gcmmf — Amul Lassi smelling foul

Address:

700012

I have purchased 1 litre amul lassi (plain) and found when opened today it is smelling foul. would request kindly do the needful to check immediately. i have purchased from Amul Shop near Hatibagan (kolkata). request you to have a complete detection of the product. i have opened it today it was sealed and it was in refrigerator. the purchase date was 13th August 2016