Samsung — Mobile phone damage

I purchased a Samsung note 10 on oct 15th 2020.
The screen had a smudge and I took it to repair center
They claim it is damaged because of impact and not covered under warrenty. They charge be rs 10, 500 for the same.

However there were no scratch mark or dent on the phone and to my best knowledge I have not dropped the phone or done any physical damage.

The repair center guys says that it is becase of impact while I think it is unfair .