Balaji chips
Shopkeeper denied return

I purchased 3 packs of balaji chips from a shopkeeper, one of the pack contained chips which were smelling. I asked the shopkeeper to exchange the pack but her refused saying it is a new pack. He said he cannot exchange the opened pack and started abusing, saying I should have sense to check the pack before buying.

I want to know if this behavior of the shopkeeper is acceptable. Please advice.