Mobile Phone — Phone not supported 4G jio sim

My phone good one spark not supported the 4G jio sim. I want to replace my phone as this good one spark phone is a 4G phone.. As it is not supported the 4G sim then it is not for my use. It is a 4G phone so that I buy this good one spark phone. I want my phone to be replaced.As I buy this online from amazon app. And I have 6 months manufacturing warrenty..