Oppo India — Oppo Reno 2 issues

Address:

193/16 first floor shivaji nagar

Dear Team,
I have an Oppo Reno2 phone the phone is in warranty, I have been facing issues from March2020, issue is my phone is in warranty, and phone not used harshly, nor it was pressed thru pressure then also my screen got damaged, after reaching service center they say it will not be covered in warranty as the screen is damaged, whereas my question where my fault lies in this the phone became hot and automatically screen became black, please get this issue resolved .