You can contact ZTE if your device is under 1 year manufacture warranty they would provide you a free repair service if your device is damage free.you can contact them on "18778171759".

Try checking with different battery and charger.If the problem is not resolved try with these steps 1.Power off the phone.
2.Press and hold Vol+ key and Power key simultaneously for about 10 seconds until the some option appear on the screen which are reboot system now; apply update from sdcard; wipe data/factory reset; wipe cache partition.
3.Use Vol+ key and Vol- key to move the cursor to "wipe cache partition" and press camera key to confirm it.
4.After 5 seconds, the cursor will be on "reboot system now" again and press camera key to confirm it. The phone will reboot automatically.