Hey, I had the same problem with a Wiko after 2 weeks, after sending to warranty 3 times without fixing it, they gave me credit to buy another phone at the store. I got the Xperia XA and after almost two happy years, the same problem appeared. If you get your phone to boot try install an app to measure the charging current. (I installed Ampere). I noticed in mine that the current was sometimes less than 50mAh and other more than 1500mAh depending on the cable position. It still says it's charging but it's actually draining battery because it's consuming more than what the charger is providing. After investigating people suggesting re-soldering the usb port, but since I'm bad with it I just replaced it with one bought online and now it works just fine. Super cheap and easy to do. If it's still on warranty just send it back and hope they are more competent than the ones I went to.