Nokia India — auto-touch problem

Address:

Chennai, Tamil Nadu

I have bought a Nokia Lumia 720 one year back and it was working fine till yesterday. But suddenly from yesterday Iam facing a problem with the touchscreen. It automatically functions without my touch and its moving to all pages. i have tried rebooting and refreshing lots of times and i got tired with it. I also went to Nokia care centre nearby and they told me to replace the Touch pad completely which is going to cost me around Rs. 7.9K . I didnt even dropped my mobile anywhere and there were no scratches too in my phone. Then why this problem is occuring all of a sudden. I didnt did any thing wrong with my phone but still iam in a position to pay 8000 to repair my phone. what this all about. This what smart phone means. I need a proper explanation regarding this issue from company side. 8K is not an easy amount. Please help me in sorting out this issue.