Mi India — redmi 4a battery draining fast

Hlo sir maine 19 oct ko redmi 4a buy kiya thaa shop se. Ussi day se usme battery ki problem aa rhi hai. Mai mi care center b gya. Unhone mere ko software update krke mobile bapis kr diya. But problem ka koi solution nhi nikla. Battery bahut jaldi khatam ho jatti hai. Maine galati krdi mi ka phone buy krke. Have any solution for my problem or i have to go consumer court?
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