Big Bazaar / Futurebazaar / Future Retail / Hometown — shopping bag

Address: Jaipur, Rajasthan, 302004

I bought a few products from big bazaar store and they charged additional amount for it. It is illegal to charge for a bag that is being for advertising the brand. I would need you to resolve my issue or else i will have take some legal action. I have bought products of approximately rs.1000 so the store is responsible to give me a bag for free at least when they are using it for promotional purposes. Why am i supposed to pay for it?