Stop jumping to conclusions. You have a 1 year warranty and free customer support for more than 90 days (yes, I know it says 90 days).
Unplugging the base doesn't remove it from your account. What is the LED on the hub showing? What exactly have you tried? If the hub is still claimed by your account you can't re-claim it. You'd have to remove all devices from Settings, My Devices to do a fresh start if that's what you want to do.
When you say you "erased it from the app to try fresh" do you mean you removed it from the app? If so, you will need to factory reset before it can be added back.
Take a look here: How can I reset my Arlo SmartHub or base station to the default values?