Micromax — replace my battery during service at micromax service center

Address:

Agra, Uttar Pradesh, 282002

Sir i submitted my mobile micromax canvas 5 e481 at micromax service centre (M/s shri nath infotech agra.). The service provider told me a problem in mobile regarding motherboard. He told me that motherboard will be repaired and the repairing cost will be 2500 rs. And time is 15 days. I agreed. During submission my mobile, i noted my battery no.
When i reached service center after 15 days, he gave me mobile and take 2500 rupees. I checked my battery no at same time, i was shocked. The battery was replaced. I complaint service provider but invain. He said that micromax company replaced my battery. When my batter was in new condition and working absolutly correct.
I shall be highly and thankful to you if you lookafter my matter.