Karbonn — Mobile battery

Address:

Sangrur, Punjab, 148001

I have purchase karbonn mobile titanium s-205 from big bazar .The issue wich i am facing battery problem.
I have serched here local Service center and check him battery. He has refuse and says battery not in warranty. I also request to service center for new battery with payment. he says battery not available right now and says try after 10 days
but no response till now.
kindly do the needful at your end and resolve this assue immediately.