IPhone 6 won't turn on or charge

I bought an iPhone 6 today from a shopkeeper I know, he is trust.worthy and would never sell something bad or wrong, i got the iPhone 6 16 GB and I checked it all in the shop and it was fine with IOS 11.2.1 i was in the car and connected the Wi-fi and started using it and suddenly it got slow and got stuck I started pressing the buttons adn suddenly the apple logo apperared and the logo restarted several times then it turned off and I came home tried charging it, nothing appears or happens, i did that reboot or reset with home and lock button, nothing works even connecting it to the laptop it does nt recognize anything.
TRIED MANY THING
Tell me what's wrong and any quick solution!

When the shop opens back up tomorrow, go and ask the guy you bought it from. If he's as trustworthy as you seem to think, he will fix or replace it for you.

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