Vijetha Supermarket — Sold expired Product

I have purchased Bingo Chips @ Vijetha Supermarket @ gokul plots. They sold me a product which was 15 days back. There where many packets like that in the store. When I and went to store and ask about that no one responded properly. Below are the words form one of the store incharge " we do business in xxx lakhs everyday in this store and its a small product if you want i will give you refund of 20 RS" that was the answer