Flipkart — Mobile POCO C51 - received- defective- sim not working

Address:

True net commerce New Delhi

I ordered POCO C51 ( Locked with Airtel prepaid)in Flipkart. I received on Thursday 19th this month. After receiving it, I bought new Airtel prepaid sim and recharged it for three months. But it didn’t work properly. Sim slot not working. I cannot use the mobile till now. Kindly resolve this as early as possible. If possible, kindly replace it with POCO C55. I Wii give the remaining amount when I receive the mobile.