Samsung India — Battery not changed

Address:

Kota, Rajasthan, 326530

I purchased a new samsung s4 mini gt-i9192 battery from samsung care..After two month the battery pack up is low.I go to care and ask for battery change..But the samsung care employee is not change the battery..I have a bill. The care employee asked me battery has 6 months warrenty. I compliant about the samsung care... my contact no is [protected]