Sony India — The service is not good

Address:

Kottayam, Kerala

I bought xperia xa on january 2017. The ringer volume notification is showing in between every time and the battery back is very low, the phone will turn off if it comes 15% or 3%. I had given my phone for 3 times in my nearby sony service care kottayam. They will just update phone software then gave back and said now it will be okey, but when i reach home and check for a wile it will be in the same previous condition and the problem is not solved yet.