Stuck in "charging" mode. Can't complete setup

I got this horrible product installed and up and running…for 12 hours. Then it killed its wi-fi connection and went into charging mode. It’s been in that mode ever since (for 12+ hours now) and I can’t get it to go back into setup mode. I’ve reseated the wires, did a hard reset, and still nothing. It’s receiving a steady 21 volts from the transformer. And yes, the “pro power kit” is installed on the doorbell ringer. And yes, that ringer system is compatible with the Ring system. Anyone else have these issues? I’m about ready to pack this piece of Chinese-made junk back in the box and return it. I could’ve gotten an entire home security system for almost the same amount of money as this one stupid camera.