Snepdeal — samsung galaxy mobile

I have order samsung mobile phone from snepdeal on 17 jul 2018.

Now, samsung is not accepting warranty. They need letter from snap deal that they have sold this product late and it's still under warranty.
With all details (Imei number and my name as buyer etc..).

I am attaching invoice copy and below details

Order id: [protected]
Reference no: 56318810
Placed on: tue, 17 jul, 2018