I'm terribly sorry for the frustration you're experiencing connecting your Echo dot.
If the Echo Dot was a gift, please reach out and make sure they the original purchaser does not have the device registered to their own account. This can happen for a few reasons, even unintentionally. If the device is currently unregistered, let's try these steps:
Make sure your Echo Dot Gen is plugged into an electrical outlet.
Press and hold both the microphone and volume down buttons until the light ring turns orange and then blue.