Vivo Mobile India — Warranty avail vivo v15 pro screen problem

Good evening
I purchased a vivo mobile phone worth 29000rs in march last year 2019. Its screen is not responding properly. I visited the service center today since it is still in warranty. I asked the service center in dehradun please replace screen as it is manufacturing issue. They said pay 6000 rs and get new.
I need help as this covid era forcing me to work from home and this chinese company named vivo is not servicing its phone screen in warranty period.