Thanks for posting and welcome to the Bose Community. I am deeply sorry to hear that you are having some volume issues with your SoundSport headphones and would love to assist you with this.
So that I can assist you further can you please confirm if you have the SoundSport Free Wireless Headphones or the SoundSport Wireless Headphones? I would also like to know what device you are connecting to the headphones with!
I look forward to hearing back from you with the answers to my questions.