My iphone gets hot, very hot at any time of day, voice control kicks in automatically and will dial anyone in my phone, it will go from home screen to internet to something else automatically, and now that i have tried to update my phone, phone will not w

My phone is getting very hot, at any time of the day, to the point it is dangerous. Voice control will kick in automatically, even at 2 a.m. and start calling random people in my phone, many many other issues. Took it to the AT&T store before it was out of warranty, they did a reset, worked until just after the warranty expired. Apple will not talk to me. i need to get consumer protection involved. Very dangerous issue with phone dangerously overheating.