removing a device from my network?

hello,

I recently added 3 Wemo smart plugs to my helix.

but I would like to rename them but I do not know which plug is which, and the MAC addresses are all the same on them in the device details. how can I remove them and read them? I have tried to unplug them all from the wall, and factory reset them, but when I go into the helix app they still show as connected to the network.