Q: iPhone 6s Plus is not turning on

I was using iPhone 6s plus since a month,  yesterday I was using Facebook on my phone,  it suddenly got stuck at the screen. I tried to switch it off but it was not turning it off, I randomly pressed the home button and power button that switched off the phone. Since then I tried my level best by pressing power button and home button for 10 secs even 60 seconds but its totally dead and I'm unable to see the apple logo. I have tried so many times by keeping it on charge but at the time of incident my battery was 86%,  had no heat up issues or anything.  Although my phone is detectable in itunes by pressing home button and power button for more than 15 secs which showed my phone in recovery mode but on my iPhone it's totally blank. What should I do?  Because I have no Apple support in my country.