Product: Vehicle loan or lease

I strongly believe this is a deceptive practice and fraud to extract more money form me in addition to what I already paid in full. I have a lease agreement for 36-months in the amount of {$230.00} a month, total of {$8300.00} paid in full. After I return the car to the Hyundai dealers they want another {$9500.00} for debt collection. This is an outrage deceptive practice and fraud for profits from Hyundai XXXX XXXX. Please allows me to explain this in detail.

I agreed to lease a vehicle from Hyundai dealer located on XXXX XXXX XXXX XXXX TX XXXX from XX/XX/XXXX to XX/XX/XXXX with the salesman XXXX XXXX ( XXXX ) XXXX. At the time of signing the agreement the salesman asks me to estimate the mileage that I may drive and the purpose for using the vehicle. He also told me if I use more mileages than his estimate that was no problem, as long as I follows the instruction to maintain the condition of the car. And I did, for 3-years I made monthly payment on time and maintain the condition of the vehicle as I was instructed. 
I was told that I have an option to purchase the vehicle at the end of the lease but wasnt required. About 4-weeks before the lease end I received a Lease-End Kit with all the terms and condition and I brought the car in for inspection. 
The inspection status report come to the total of {$1300.00} for repair service ( with {$290.00} for transmission fluid? XXXX. On XX/XX/XXXX I received the inspection report status I called and spoke to XXXX XXXX XXXX he said its only an estimate repair suggestion. I could get these items done at this Hyundai dealer or any other auto shop of my choice and its not a mandatory. He also told me the {$400.00} for 4-tires was a mistake it shouldnt be included in the report after I told him I had bought the 4-new tires just few months ago with proof. The service manager also told my son the car inspection was clean and good. 

On XX/XX/XXXX I received a letter from Hyundai XXXX and I spoke to the salesman XXXX XXXX because my son wants to buy this car and wants to know the price ( XXXX ), I was told the price is firm and not negotiable, my son couldnt afford for this price at the time because he got lay-off that same week. 
On XX/XX/XXXX my son and I brought the car back to the dealer I gave the keys to the salesman XXXX for the final inspection. He came back later with a happy face and said the car is good and clean. I asked him specifically Do I own anything or require to pay any additional fee? The answer was No, you dont own anything and youre good to go, I hope you come back and buy a car from us. 
Then on XX/XX/XXXX I receive a letter from Hyundai XXXX demanding payment of {$9500.00} that I own them and is a debt collection. 
1 - I paid {$230.00} at the time of signing lease agreement plus 36-monthly payments paid in full {$8800.00}.

2 I paid my bill in timely manner and pay as agree with the amount, and I follow the instructions to maintain the condition of the car.

3 I brought the car in for inspection when it was required, twice I was told the car clean and in good condition after the inspection.

4 - The dealer was happy when I return the car in clean and good condition and said I own nothing, but Hyundai XXXX XXXX want to extract more money that falling from the sky. 
No body at this dealer review the terms and condition of Lease End with the penalty price of {$9500.00} to me at the time of signing the agreement, or gave me a choice to decline or accept this kind of leasing condition. The intention and the scheme to rip-off a consumer like me is clear and very obvious at the end of this lease agreement. This is as same as you hand over to me a 6-months old baby and wants me to return that baby after 3-years still the 6-month old baby, that is impossible. 
This is an outrage deceptive practice and fraud to extract more money from a consumer like me. I am near XXXX old retired lived on SSA benefit and I am not asking for hand-out, nor do I want to get rip-off from Hyundai Motor Finance. I am asking for your help to investigating this type of fraud that car company and their dealers throwing at the consumer every day. I am looking forward to hearing from you and thank you very much for your understanding. 
Sincerely, XXXX XXXX