Telefon açtığımda mi yazisi cikip kapanıyor

Hello, the phone turned off when it was at 15% charge, we plugged it in, there was no sign of charging on the screen, it remained on charge for about 4 hours. When you want to turn on the phone, the MI logo appears on the screen and goes back within seconds. The phone does not turn on. I tried a different charging cable and adapter. Can you help me?