Milky Mist — Milky Mist curd has 40 days expiry and tastes very bad not in curd taste

Milky mist company curd has 40- Days of expiry on there curd, but other curd has only 4 days expiry on their packets, so i think they are adding harmful preservatives on their to product, when i taste the product its not tasting like a curd, please check is that possible of 40 days of expiry,