Phone wont turn on

Hello Guy,

I had kept My RN3 pro con charge last night and when I woke up, It was really hot and switched off. I tried to boot it up but no response. Tried to plug it in to the wall charger and notification LED started to blink. Tried to put it to fastboot mode but no success. Now when I am hooking it to PC no response. When I am hooking upto wall charger top left side is getting really hot on the back side.
What shall I do?

Thanks in advanced