“You should look into your finance agreement and find out if the gap insurance
was added to your loan. You can also look into your monthly payments to see if you were being charged the fee for your gap insurance. If you were being charged the fee, then you’ll most likely need to reach back out to your lender. With proof, they may be willing to negotiate on the amount, as you were being charged for something that you never received.
It is most likely that there was an error when someone finalized the paperwork at the dealership or with your lender.
If you do have proof and aren’t able to resolve the situation with whoever is responsible, you may need to reach out to your state’s Department of Insurance and Financial Services. They handle complaints as well as fraud within the industry.