Product: Vehicle loan or lease

I was financed for a new vehicle on XX/XX/XXXX and after I explained to the lender that I do not get paid normally like most people do. I get paid about every 3 months or so and I make my payments when I do. That wasn't a problem at first. The lender claimed they understood the situation and they always got paid at some point anyway, so, no harm, no foul, right? 
I didn't have a problem paying the late fees because I understood their stance as well. All I asked is that the late fees be deducted after the principle amounts were paid. In other words, I wanted to be paying off the loan, not making late payments for 15 years. They understood and agreed. At one point, they no longer sent me statements, showing where my money was going. They told me I could find this information in my online account, but this was not true. They had limited my access to where I could not see where the money was going, only my profile information and due dates. Very generic and vague information. I had made a few calls to inquire, and the total amount owed and paid they had given me was not at all close to what it should have been, even by doing the math in your head, you could tell it was not right. I asked on 2 different occasions to have a payment statement mailed to me. I wanted to check their records against mine, and they agreed to send me the information. However, I never received it. On XX/XX/XXXX, I sent them an offer to tender payment. I never heard anything back from them. Now, I've learned that they've charged off the loan. I've had several issues with whoever continues to stalk my property, follow me wherever I go, etc. This began prior to the chargeoff, but shortly after I sent the offer to tender payment. A chargeoff has been applied to my credit report. I can not in my best interest continue to pay on a note when the lender refuses to provide me with their account of what's owed to match with mine. The reason they're doing all of this is because they have added several thousand dollars to the total price in the note. Furthermore, the contract they gave me has a bogus total amount that I didn't agree to, and they have it in a place I didn't look when I signed the contract originally. It looks harmless, but it is a contract. I was not given any notice of another about to be paid. It doesn't matter if they added it incorrectly. That's their mistake and it voids the contract for I wasn't given all of the information about the contract, and if I had noticed this price increase, I wouldn't have purased the vehicle, or at least not had them finance the vehicle. Granted, the payments I was making to the best of my knowledge we're accurate with what I had agreed to pay, but given all the sneaky things they've done up to this point, it doesn't surprise me that they would try something like this. The total price increase from their fraudulent contract is about {$6000.00}. Once I caught on to this, I notified them and this is about the same time they started getting sneaky. Now they've sold their fraud to someone else thats going to expect me to give up the vehicle when I haven't done anything wrong but make some late payments on a fraudulent contract. The lender has chosen not to speak to me any further in writing, which is how I prefer to do things. Lastly, I recorded the phone conversations where I asked for a payment statement to be mailed to me, and when they agreed to do so, but they just never did. The offer to tender payment should have been replied to, yet they charged it off and sold it to cover their own. The amount financed was {$37000.00} I agreed to pay the total of payments equaling {$48000.00} and after my my down payment of {$6000.00}, somehow I'm supposed to pay the total sales price of {$54000.00}. It's in the attached copy of the contract. Additionally, my credit report states that I have made 56 % of my payments on time. How accurate that is, I'm not sure. {$20000.00} is what I have paid to date. They are claiming I still owe {$26000.00} not including interest to be paid which is around {$11000.00}. I haven't done the math on this yet, but I think I see what they're trying to do and it's fraud.