Lenovo — lenovo k3 note malfunctioning and poor service of the authorised service center in puducherry

My lenovo k3 note mic and display started malfunctioning all of a sudden for no fault of mine. When approached the service centre, they told me that nothing could be done to set it right. Further, they told me replacement of the spare parts would cost more than 5000 rupees. I had purchased the phone just about less than one and half year ago for 10000 rupees. As such, it is not fair that i will have to spend more than 5000 rupees just shortly after the warranty cover of 1 year expired. This clearly indicates the poor quality of your product. I'm greatly grieved by the poor quality and funtioning of your product. Kindly address my grievance at the earliest. Looking forward to get a timely and fruitful action from your end.