Sony India — No Service Request responce from Company

Address:

Jamnagar, Gujarat

I have purchased 48 inch Sony LED on 9th Nov 2014 and Some Yellow colour strip is started to come continuously from 6th June (after 7 month). I have launched service request same day with ID 25830052. After that I have called number of times at cutmore care but always getting same responce "Engineer will visit your home address" I have send mail also for the same issue but also not getting any responce on mail also.