Flipkart — rejected exchange offer to my good conditioned old phone

Address:

InIT Solutions,Room No1,2nd Floor,, Krishna Prabhu Building,, Basin Road,Broadway,, Ernakulam, Kerala, 682031

Last week i orderd redmi 7s with an exchange offer order no. Od[protected].
My old phone passed all tested by flipkart app and assured rs2200 as exchange value. And i am sure about there is no physical damage as described in exchange policy.
But when the guy came for delivery, checked my old phone and told me that cannot accept for exchange. The reason he told the phone has physical damge and shown me that of the cover of phone near headphone jack as i attached image.
Now i realized, i can only exchange my newly bought phone to another one.
So very much thanks to flipkart for the information shared.