Your best bet would probably be to go to your state Department of Insurance. They're the ones who regulate insurance in each state, including issuing licenses and appointments, and agencies and carriers tend to take DOI complaints seriously. It wouldn't necessarily get resolved fast, but they would have the authority to do something about it, if there are any grounds for taking action.
(The federal government, for mostly historical reasons, does not generally regulate insurance except for health insurance, and that only started with Obamacare. So each state has its own DOI, and agents and carriers have to get licensed in each state. It's a dumb, byzantine system going back to Paul v. Virginia in 1869, when the Supreme Court ruled that issuing a policy of insurance is not a transaction of commerce. I don't think that reasoning applies today, but Congress has specifically exempted insurance from things like anti-trust legislation since then. Sweeping insurance under federal regulation would, in theory, cause a giant mess since there's so much law and process built around the current state-by-state system. IMO it would be worth it because the current system is completely ridiculous, but so it goes.)
