when i want to charge my phone I CANT

i cant charge my phone. it keeps saying usb connector connected. usb connector disconected repeatdly plus A THING KEEP POPING saying : this device is charging another device that is connected via USB. This increases the battery consumption of this device.Disconect the USB Cable to stop charging the conected device. Note: i didnt use never a usb in my phone. my phone is galaxy s8PLUS PLEASE help me?

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