How to get OnePlus One sound problem fixed in India?

Hi,
I have purchased my one plus one mobile in the month of August'15.Initially sound problem was there but I though it would be network problem. So, I change my portability and still problem is there. Maximum time I am unable to hear voice and other person is also not able to listen me. Please suggest how to replace it soon. Kindly explain me detail procedure in India.




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