My Garmin D2 Bravo gps watch is not switching on even when after it’s fully charged. Please assist

My Garmin D2 Bravo gps watch is not switching on even when after it’s fully charged. When it’s connected to charger it showing 100% charged. But once I disconnected, the display turns in to blank.

also could I know, if there is any Garmin service Center in Uganda or nearby country.