I bought an expired product from Star Bazaar and after arguing with them, they promised me a refund of Rs. 9,000. However, they later went back on their word. I have all the call recordings and the product with the bill as proof. I want to take legal action against them.

You have a strong case for legal action against Star Bazaar for breach of contract and misrepresentation. The expired product and call recordings provide evidence of their promise and subsequent refusal to refund. You can file a consumer complaint with the Consumer Forum or approach a civil court for monetary compensation and damages.