My phone is not switching on

Lats night my phone was working fine suddenly it says phone is overheated keep it in cool place then my display starts acting weird i.e. unable to respond to touch. I unplugged the charger and restarted the phone. After that my phone is not starting tried multiple times and also tried charging it for 2 hours and then try to switching it on but still not responding.
Any suggestion what i could do?