Nokia India — nokia 3 display not working properly

I bought nokia 3 from croma stores aurangabad maharashtra in last month. On same day i faced trouble while downloading apps from play store. After so many hardship the problem was corrected by formatting the phone. Now since last 7 days i am facing the problem with display, even after pressing the lock button screen is not getting on immediately, it is taking time of 15 to 30 second to make the screen on. No display appears to receive the call while i receive some phone call and even after pressing the button it is not getting on immediately, unable to receive the phone call. I am rally struggling a lot because of this phone. I don't need this phone at all. Kindly replace the phone or provide some other brand phone of the same cost.