Amul Cheese Spread Red Chilli Flakes — product given of expired date

the above mention product code no VFHO94/1 packet on 04/04/2014 sold to me on dated 02/03/2015 by ANNAPURNA BHANDER .11, SHIB CHATTERJEE STREET BELUR HOWRAH -711202.VIDE- BILL NO-22882 UNDER VAT NO-[protected]. the said product expired on 04/01/2015.my mistake is that i did not notice and the said product was opened by me and also use by me roughly around 8 to 9 gm, so the product was refused to be changed or replace by the seller saying that the product cannot be changed as the company will not replace. my complaint is how the company is selling the expired product and why the said product will not be replaced.