IPhone 5s :: Not Charging / Not Responding Neither To Charger Nor Computer

When I connected my lightning cable in my phone, suddenly the cable heated and immediately I took it off from the phone, the phone was working properly and it had about 8% charge. I left it for about 48 hours as I didn’t have the cable, It's had no power for some days since I lost my lightning cable - it's basically completely out of power. I've charged it once in the last week with a certified Apple lightning cable, but now it no longer responds to any cables at all.  I've tried with two different cables (neither are certified Apple cables, but both work well with their owner's iPhones) and the phone does not respond at all. I've tried charging through my computer and using a wall socket, but the phone does nothing, even after it's been plugged-in for more than 2 hours.