Thank you for your post and welcome to the Bose Community.
I'm very sorry to hear that you are having some problems with your QC15 headphones.
We do not repair headphones due to hygiene risks, however, we do have some great replacement options. I would recommend contacting your local customer service center to explore these. Global Contact Us > Select your country > Scroll to the bottom of the page > Click 'Contact Us'
Before replacing the headphones, I would recommend testing an alternative audio cable (if you require one of these, please contact support).