Product: Consumer Loan

I have XXXX car loans with the same lender. They have erroneously posted payments to the wrong account, which resulted in the other loan becoming behind by two months or more. The company then began repo activity to repossess the car. I contacted the company and attempted to resolve the issue, they were uncooperative and rude. They refused to correct their error and credit the payments to the correct account. They demanded payment immediately or would repossess the car. I asked for a supervisor but was told that none was available and they would not do anything about the issue anyway. They claimed that payments were not made on several occasions and that late fees had accrued resulting in both loans being behind by {$1000.00} each ( more than XXXX months ). I had contacted the company previously in XXXX 2015 and made a payment to bring the account current, because they had posted payments to the wrong account and refused to correct the error. In XXXX 2015 the company claimed that the loan was {$1000.00} behind, even though it was current the month before, stating that late fees and other penalties had caused the amount to be so much. I could not get anyone to explain the creative accounting method which they are apparently using. The XXXX loan had XXXX or more payments credited to it, that were made to the other loan, in addition to the correct payments that were made to the XXXX loan. The XXXX loan was paid XXXX months in advance at this point, however the company claims that the loan is {$1000.00} behind, due to late fees and penalties, and that the payments that were in excess of the payment due were not credited as future payments, but applied to the principle. Thus having no effect on reducing the monthly payment amount nor being available to credit the overage to the XXXX loan which was behind by several payments because they had made an error. They first said they could not apply the erroneous payments back to the correct account for the reason that they had been applied to the principle instead of a future credit, then later in the conversation they claimed they could not correct the payment error because the XXXX loan was also behind by {$1000.00} due to missed payments in XXXX and XXXX 2015. The missed payments were the result of not clearing the bank, however the payments were sent within a few days of the event, to keep the loan current, and the loan payments were never more than two weeks late. I could not get any explanation of how they had calculated a past due amount of over {$1000.00}, nearly XXXX payments, when the loan had never been behind more than a couple weeks. They claimed it was " likely '' due to late fees and that I should pay my bills on time to prevent this from happening. I advised them that I had the payment history in front of me and that their information was incorrect, because the payment history showed payments every month, with a second payment made whenever a payment had not processed as well as several months with the payment for the XXXX loan posted to the XXXX loan incorrectly. The loan payment for the XXXX loan is withdrawn automatically from my checking account. The payment for the XXXX loan is made manually online through XXXX XXXX and requires the account number to be entered. I have only made payments to the XXXX loan by this method thus I have never entered the account number for the XXXX loan, which would indicate that the error is in there payment processing method and not with my payment method. 
I spoke with several reps but they all repeated the same prompt, they demanded payment immediately or would have the car repossessed, I offered to make a payment the next day when my pension payment would be available because I did not have the money available until then, they refused any compromise. 
I believe their business practices are fraudulent, deceptive and in bad faith. My dispute was ignored