iPhone 13 Pro Max stopped working automatically screen got green

Hello Please Help Me😩😩😩

I bought iPhone 13 ProMax on 18/3/22 Phone stopped working automatically screen got green on 14/12/22😩There is no external damage. authorised service centre asking for 73K get the phone replaced🥺Mobile is still in warranty.This is awful experience I had😭help me😩😫

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