Flipkart — Delivery with exchanged item

Address:

Buliding Alyssa, Brgonia, clove embassy tech village, Bengalauru 560103 karnataka

I have placed one order of realme C12 with an exchange offer, I have a oppo A3S which I wanted to exchange they have certain terms and conditions with exchange item, the terms are like this if no issue in old device the exchange price will be 4550, if body issue like dents, cracks & part missing the the exchange value will be 3350 and if phone screen issue like crack, discoloration, screen coming out, touch not working or body de shaped / bent then the exchange value will be 2200, when I inserted the IMEI number its shows me 4550 and I paid advance the remaining amount, the delivery agent came to my place checked everything didn't offered me any of the above amount then he told me wait for 30 minute I will come with my senior, he came after 30 min with a local guy and that guy DON'T have any icard of flipkart that i can identify him that he is from flipkart, the 3rd party guy took my mobile phone and he checked everything after that he told me that he wants to open the glass whether he DIDN'T offer me any amount as per the terms and condition and the delivery agent was standing beside the 3rd party guy (broker), I DON'T know how flipkart allow a broker without proper doc with the delivery agent this is a serious concern that 3rd party can run away with my phone, they have harrased me from the morning request you to please look into this matter.