Lava Mobiles — Parts missing after service

Address:	Dakshina Kannada, Karnataka, 575004
Website:	www.xolo.in

I have a xolo 8x-1200 mobile handset (invoice attached)
which i gave to LAVA service center for repair
They returned it back with sealed cover and asked me to return back to seller.
But seller refused (e-bay).
I also contacted XOLO through contact up page(by submitting QUERY) in xolo website, for which i didn't get any reply.
So i opened the seal.
After opening the seal i found that the phone was not mine and battery was missing.
I have been sending email to LAVA, but they could not resolve the issue.

Please help getting me back my original phone

thank you