Ring doorbell 3 stopped working

Worked fine and all of a sudden recently (under 12 months old) it’s stopped working we saw the WiFi issue error in the app so replaced the battery and nothing changed so we attempted to reconnect the WiFi but it won’t show the white flashing light, even though the battery is fully charged when you plug it in the doorbell it shows no sign of life, no flickering blue around the doorbell ring and no flashing white whilst pressing the red button to reset it? Any help!