I'm sorry to hear that you're experiencing issues!
Could you elaborate on the behavior of LEDs on the device itself? Do they show any signs of life?
Could you try a different Ethernet cable? We had a similar case here, where the issue ended up being the faulty cable.
Otherwise, I'd recommend performing a factory reset of the device using the reset button as described here.
If the device's WAN port works, could you try adding it to RMS and see if it's reachable that way? One free month of RMS should be included with every device.
If none of the options above work, I'd recommend returning the device for warranty repair/replacement.