Consumer Redressal

This is regarding an ongoing problemn with my Ideapad which hasn\'t been resolved by service center. They already replaced Motherboard, Hard Disk, Battery, Speaker, charger, Keyboard bt the problem is still there. Beeps at the boot time, keyboard started giving problems again and engineer suggested a replacement again. Can\'t tell how much data I\'ve lost due to it\'s freezing because it doesn\'t work at all and the only way to get it working again is force shutdown using power key. I\'m fed up with all these useless repairs. I\'m seeking the solution and i want to replace it. I mail many time to lenovo consumer care but they said \"the case is not meeting DOA guidelines.\" for replacement so we can\'t replace it. I\'d appreciate if you help me, being a consumer firstly i complaint the lenovo. but now there is no respose from other side. Now this is my last hope for resolving my problem. I\'m sure,you will understand the seriousness of the case. Product name - idea pad Z460, CBQ3160453