Product: Vehicle loan or lease

I am involved in a consumer credit transaction with Infiniti Financial Services who will be referred to as XXXX from here forward and XXXX XXXX XXXX who will be known as XXXX from here forward. I have had many issues with XXXX and the way my account has been handled as well as some glaring discrepancies in the TILA numbers disclosed by XXXX at the time of application. 
Starting with XXXX, I requested a payoff bill to pay the account in full. On XX/XX/XXXX a payoff bill was created for me to pay off my account in full by XXXX. That Payoff bill of exchange was sent to me. That XXXX of Exchange was indorsed by me and sent back to XXXX in the amount of {$66000.00} with a letter of instruction to XXXX from me included on how to act on my account. This Payoff Bill of Exchange and Letter of Instruction was sent to XXXX payment center, address XXXX XXXX MXXXX XXXX XXXX XXXX XXXX XXXX, XXXX XXXX, by way of certified mail # XXXX XXXX XXXX XXXX XXXX XXXX. This certified mail was signed for upon delivery by XXXX on XX/XX/XXXX at XXXX. After following up with XXXX about my payment I was informed by XXXX that they " never received '' my payment despite having it singed for by an XXXX authorized representative at the correct address through certified mail. At this point I informed XXXX that they have a responsibility to me as the fiduciary to take care of payment instruments tendered to them as they are a holder in due course. I also told them to open a payment investigation and find out what happened to my {$66000.00} payment. I never received any answer or solution to my payment investigation. Instead I received harassing and stressful calls up to 4 times a week to collect payment. Every call i received has been recorded and starts with me asking the debt collector to open the notes on my account with XXXX at which time they would read the notations on my account that included my account being under payment investigation yet still they would push and push for payment, yelling, screaming and interrupting me despite my account waiting for resolution from XXXX. These calls have caused an extreme amount of emotional stress and damage. 
Realizing Im not going to get a proper answer as to where my first payment went after they signed for it or for the payment investigation at all, I sent XXXX yet another tender of payment in the amount of {$66000.00} on XX/XX/XXXX through certified mail # XXXX XXXX XXXX XXXX XXXX. This certified mail was signed for upon delivery by XXXX at XXXX at XXXX XXXX XXXX XXXX XXXX XXXX. The address it was sent to is XXXX XXXX XXXX. XXXX, XXXX XXXX. I have not received a response to date from XXXX concerning anything Ive sent them at all, instead I was sent a Letter of Default for non payment by XXXX despite performing in full on the account twice and full instructions and communication from me every step of the way. I refuted and contested the letter of default with a letter of response through certified mail # XXXX XXXX XXXX XXXX XXXX XXXX. 
In recent developments XXXX is now adverse reporting to my credit via XXXX despite an unanswered payment investigation on their part and two attempts to perform on this account. This is causing an extreme amount of damage to me on multiple levels. 
Also recently discovered after closer examining the TILA disclosure that was provided to me by XXXX is found to be deceptive and misleading. The APR and finance charge are grossly misrepresented. XXXX has apparently violated the truth and lending act by overstating the XXXX and understating the finance charge. The disclosed APR is overstated at 4.40 % when it actually calculates to 2.39 %. The disclosed finance charge is understated at {$8400.00} when it actually calculates to {$15000.00}. Under the mortgage improvement disclosure act section 226.22 ( a ) ( 2 ) ( 3 ) these discrepancies in the APR and finance charge are far outside allowable guideline tolerances and constitute an unconscionable contract prima facia. These are predatory and deceptive lending practices. 

INFINITI FINANCIAL SERVICES XXXX XXXX XXXX XXXX XXXX  XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX