Amul / Gcmmf — Received stale 500g rasmalai box

I have purchased amul rasamalai 500g from ambika medical shop from Badlapur west on 24th March’22, It was frozen so I kept it in hot water for 10 minutes post we opened to consume the product but the product was stale and was smelling sour so I went to medical shop to return but he refused to return us money back, l want resolution as we have paid 200, I am sharing the image of the box and product for your reference.