Ekart Logistics — Mobile exchange related

Address:

Nabadwip, near buro shibtala, Nadia,741302

Tracking ID number FMPP[protected]
The delivery boy visit at my doorstep at night 8:30 pm and tell me that he can't exchange of my Realme 3 pro mobile I will order it on offer and get the price 6700 but he tell me that only 3000 rs I get with exchange,
Then I question him, he reply that he need a mobile for his wife because my mobile condition is excellent,
My first question is I will give the mobile to company or delivery boy?
The rate how much decrease from 3000?
Purchase time I get imei number and no crack on my mobile,
This is too much pathetic service from ekart,
My register mobile number is [protected]