Toshiba India — Issue with keyboard of my toshiba laptop

Address:	Mohali, Punjab, 140103
Website:	none

Respected Sir,
I have bought a toshiba laptop l50-b y3110 in Aug 2014 with 3 years warranty.
After quarter of year it started giving me troubles. Till date they have changed the top cover if lid, screen, adapter.
Now 10 days back some of its keyboard keys stopped working. I complained toshiba about that. The engineer visited my place and said that it can't be changed because of two small 2mm cracks above the power cord socket on the side of the laptop.
The crack has nothing to do with the keyboard for a consumer as the consumer don't know while purchasing the laptop that the whole assembly needs to be changed for a keyboard replacement. I again contacted them by mail. Thay again issued me a complaint number and then the engineer again said that it can't be changed. the cost of the keyboard is 7154 rupees which is too much. Kindly assist me for my problem.
Kindly do something if you can.
My laptop serial no is 4E130389C.
I am attaching the pics qith this mail.
Thanks