Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
In this case, I would presume that you need to contact LG themselves, and put in a failed-within-warranty claim on the defective Bluetooth earpiece, for free-of-charge repair (or replacement, if LG so chooses.)
LG may be contacted through
where you should probably choose the Mobile Device Repair option.
Please let me know, by the Reply To Expert function, whether this information is helpful to you - or not. Thanks.