Charging using laptop / computer
Put the Earbuds inside the charging case
Using the C-Type usb cable reveived with the product, connect the Charging case with the charging cable to the USB port on the laptop/computer
Make sure that your PC/laptop is turned ON and not in sleep / hibernate mode
If it still doesn't work try with a different USB port on your laptop/computer just to be sure whether an issue exists with your USB port
Charging using an adapter
Connect the Charging case with the C-type USB cable reveived with the product and connect it with a 5V Adapter
Make sure that the wall socket is functioning properly and not loose or damaged
If it still doesn't work try to charge from a different wall socket
If the headset still doesn't charge try with a different USB cable that is suitable to connect to your headset charging port just to clarify whether the issue is from your current charging cable