I recall hearing about the same problem you're having... hopefully, you're still under warranty... If so, Samsung will replace it for you. Unfortunately, if you're out of warranty, you'll have to buy another one. I'm sure they will sell "singles".... good luck!
Btw, here's another thread here on Samsung with guys who have the same problem.
Just to clarify are you referring to the Galaxy buds or the AKG headphones?
Thank you for that information. I would be happy to assist you further. There are several possible factors why sound is not playing from the headphones. It could be as simple as the volume is too low, or possible physical damage to the headphones. Give this link a try: https://www.samsung.com/us/support/troubleshooting/TSG01001072/
Can I please have the following information in a private message: http://bit.ly/2JH2rq2
Best Contact Number:
Alternate Telephone Number: (If Available)
Bill of Sale for the S20:
Model Code for the S20:
IMEI Number for the S20: