Iphone5 not turning after 100% charge

Hello,

I was using my iphone5 after 100% and all of sudden the phone turned off when i was browsing, i tried to connecting to the charger,laptop,pc but still i couldnt switch it on.. it doesnt show up in itunes also.. i followed all the apple troubleshoot solution but still i could switch it... I tried holding home and power many but still it didnt show. My phone is still under warrenty in uk. PLease help me what can i do? will apple give me replacement. i used all the apple products for my phone ,i never pluuged my phone for chinese cables and adapters... can someone help .please. i dont mind about the data init.i want to switch on the phone...😢