Intex Mobile / Intex Technologies — Mobile is not starting

I purchase invoice no. f0418del16-15451 of rs 7100/- mobile (intex aqua power plus imei no. [protected]) through flipcart on 15 oct 2015 and with one year warranty. the same mobile is not working now. the mob give customer service centre at sh. radhe communication davi bhawan road hisar ([protected]) but he charge rs 900/- bill no. 067 and change the battery (battery no. 416190). the mobile worked for two or three day and now is again swiched off. it is not working from previous month
May i request you to kindly replace or change the mobile.
Please give me direction.