PK--- I am not doing devil's advocate here but I think you should check the expiration date before you buy it. Most of these bugs are created because of the heat and warm weather. If I were you, I'd go to the store and talk with owner/manager, unless for $50, you're willing to forget everything and start over.
Keep in mind that there are only few Indian stores in most cities. If they get fined, they are not gonna close down, they will increase the price of items and you end up paying for it in a log run(may a lot more than $50, if you're lucky to pull his tooth to get this).
Soon, The indian grocery will be like a health plan...no one an afford it. It's a long haul to get products from India to you kitchen and it takes quite some time.I'd suggest to go to the store which has more turnover so that you have better chances to get fresher products.
My 2 cents.....