Rear camera and flashlight doesn't work

My rear camera and flashlight doesn't work but my front camera is working just fine. I downloaded flashlight app and it says i have a hardware limitations but i don't know why it happened. Please help i'm desperate i just bought this iphone 5s 32GB four days ago. the rear camera and flashlight is working just fine yesterday and suddenly i can't use it. I have restart my phone like a billion time please help:(