Hallo…
I had a really frustrating run-in with a rep at one of your dealerships, and I want to file a complaint about it. Can anyone tell me where to call or who to reach out to for this?
Best wishes…
Speak with the appropriate agency’s Office of the Inspector General (OIG).
State or local representatives: 
Get in touch with the local consumer protection organization or the attorney general’s office in your state.
Speak with the securities regulator in your state or the Securities and Exchange Commission (SEC).Speak with the insurance department in your state. 
Get in touch with the real estate commission in your state.
Speak with the BBB, the Better Business Bureau.
Healthcare professionals: Speak with the medical board in your state.
Prior to file a complaint, 
it’s critical to obtain as much information as you can, including the representative’s name, contact details, and incident details.
To locate the Attorney General’s office 
in your state, conduct an internet search for “[Your state name] Attorney General.”