Hi @Pavan10, I am sorry to hear about this.

If a software repair using Xperia Companion and a computer did not manage to improve the response of the display I would suggest that you contact your local support team in order to have the phone sent to an authorized service center to be examined and possibly repaired. 

If you have any questions regarding the service, such as routines, warranty and consumer laws, these type of questions are best answered by your local support team as well, as they vary between markets.

I am sorry for any inconvenience this might cause.