Can you give more details on what is happening?
Screen should show:
Level 1 Charging (120v)
Level 2 Charging (240v)
You should be able to set reduced or max for each level.
The car recognizes which cable you plug in, 120v or 240v, and then charges accordingly.
A 120 volt cable has one 120v hot wire, one neutral wire, and one ground wire. A 240 volt cable has two 120v hot wires, and one ground wire.
What happens when you plug in the 240 volt charging cable? What color lights at the charge port?
What brand charging station? What settings does it have?