Sangeetha Mobiles Private Limited / Sony C2104 Xperia L — I can't use this phone as it's burning my ears

Address:

Hyderabad, Andhra Pradesh

Onsite complaint id - 82849
Sangeetha mobiles invoice - si/mjm/5418
Siri communications - w[protected]

I have made online complaint through[protected] that my sony mobile is not getting over heat all the time, volumes buttons and camera were not working.
On 28 the may onsite people had picked my phone - veryfing the device and today that os on june 7th 2014 returned my phone without rectifying the phone getting over heating and volumes buttons not working.
I have reached siri comminications - they mentioned it's an mother board problem and mentioned sony will not replace mother board.
Please help how to proceed further - i can't use this phone as it's burning my ears.

Regards,
Muni
A. [protected]@gmail.com