Xiaomi India — regarding warranty issues with my product mi a3

Address:

Chennai, Tamil Nadu

I have bought brand new mi a3 on 02/09/19.
Few days back i have experienced trouble with my touch screen so just visited nearby service centre to checkout this problem.
Initially they have tested my device and informed that there is software issue.
I have asked them to go ahead to solve the issue but later they have informed that issue is with the display.
And suggested me to replace it, i have asked them to claim the display with the warranty replacement as i have seen noticed warranty for display malfunction for 1 year.
There is no external damages on my display.

But they refused and compled me to replace under payment.
Why should i pay when my device is at warranty.
Such a non professional answers from your guys.

I need a proper reason for replacement under payment or else replace under warranty. I never expect such a poor quality with the product and customer service.
And this is my 5th mobile with xiomi each and every from my family are a customer of xiaomi.
Because we had trust with the brand