Nandini Milk — shelf life mentioned double dates and selling expired products

I have bought 1 pack of 200ml Nandini milk in the evening (13.apr 20 7:40pm), in that mentioned 2 self life dates
1. in the front pannel mentioned B1 USE BY 13 APR 20 M55.
2. in that back pannel mentioned B1 USE BY 6 APR 20 M56

i think you are doing reselling and recoding the products which are stocking.

Please check with your database and avoid this type of expired products sales to the consumers.