Mother Dairy — Product expired (4 days) before it's expiry date

Address:

Mother dairy booth no - 540 F - Kamla Nagar (in front of SBI Bank) near by sparks mall Delhi - 110007

I bought a packet of paneer 200 gm on 15th of August 2021 whose MFG date was 10th of August 2021 (best before 15 days of manufacturing date) and I opened it yesterday and I found that its smell is not right and I taste sour and bitter so that was expired before it's expiry date help me in this issue