I'm sorry to hear that your left bud stopped working for you! Can we try a reset of the headphones? I'm including the steps for this below:
Please let me know if this helps! If it doesn't we can see what your options are from there.
Thanks so much and I hope you're enjoying your day!
Thanks for clarifying and sorry to hear that didn't work. It sounds like your best option at this point is to reach out to customer support here. Just select your country and scroll down to where you see "contact us". When you speak with support they'll be able to provide you with some more information on what your available next steps are. I hope you have a wonderful day and thanks for getting back to me.