Assuming you've tried what others suggested above, time to call an electrician. Need to make sure you're getting both legs of 120v for 240v total to the charger.
THIS^^^ is the correct answer. I worked at a Ford dealer for 11 years and we would prioritize our customers that purchased from us 1st, everyone else last. We never refused to work on anyone's vehicle, not even a Dodge or Chevy, if it rolled in we worked on it.
Hell one time I had to go out in...