Tarah Pro - Just purchased, won't turn on out of the box and won't charge properly

I just bought these headphones yesterday. Out of the box they wouldn't turn on so I set them to charge. I left them charging overnight using my computer's USB. They were pulsing white while charging but finished the charge fairly quickly as the light went solid white within an hour. I still left them charging overnight to try today.

Today, I see the white light is still solid so I take them off the charger to try them but they won't turn on. The only way I can turn them on is when they're charging. And the app says they're over 60% charged but the moment I take them off the charging cable, they turn off and I can't turn them back on unless I plug them back into the charging cable.

Something seems wrong with the battery. When the white light is solid, the app doesn't say they're at 100%. They're at 50-60%. One time when I plugged them back onto the charging cable and turned them on, the app showed 100% yet the white light was still pulsing.

I don't know if it's a problem with the charging cable or the internal battery of the headphones. Either way they came faulty out of the box as I haven't even been able to use them once.