Thank you for your post and welcome to the community.
I'm sorry to hear that you are having this issue with the SoundSport Free Headphone case. Please select the following link - SoundSport Free Charging, This will provide further information on charging your headphones. If this does not help resolve the issue, I would suggest contacting your local Customer Support Team for further assistance.
If you select the following link - Contact Us, select you region and scroll to the bottom of the page and select contact us. This will provide you with their contact number.
I hope this helps resolve your issue, and if you have any further questions please do not hesitate to contact us.