Then call him back. If you bought and paid for a unit that is 120/240v then that is what you should have. If you go in trying to re-tap the gen. and it blows then it is on you. Let them do it or find out what is going on. That way you do not risk voiding the warranty.
A different Generac dealer fixed it. Simply put, the wiring was wrong. Wire 11 was wired to where 33 should have been and vice versa. Quite odd but fixed. However, the new problem just arose 3 days after having that done:
Engine Will Crank, Won't Start
Checked Fuel, Checked Oil, but I have a question about this. Near the Starter Contractor is another Fill Cap for oil. No dipstick. Not sure what this is as the Manual does not state a Fill Cap being here. When removed, it looks empty.