Consumer Redressal

I have purchased Xiaomi mi3 phone on Aug12, 2014 from Flipkart and paid 14000 Rs. Today it screen got damaged just by little jerk and its touch button stopped working though screen is working. I called Xiaomi service centre for resolution and they told me they have to replace screen, touch and motherboard and it will cost 7000 Rs. While my screen and phone is working, only 3 touch buttons not working and still they charging price half of the cost of phone which is not reasonable. They are cheating customers by selling phone on low rate and charging high price for every small damage. I want to register compliant against Xiaomi for cheating customers. They should replace my phone or repair it with minimal cost.