Lenovo — battery and back cover replacement

Address:

110020

My lenovo s850 smartphone battery and backcover damaged. So i went to lenovo service center, okhla, delhi for replacement. They told to take 7 days for replacement. But its already 28 days gone they are saying parts not available. They gave me a contact number which is unanswered every time. I am completely fade up with this approach of the service center.