Santander USA Citifinancial Auto Payment not applied correctly, payoff balance wrong Fort Worth, Texas

My auto loan was sold from Citifinancial to Santander.  I have never received a statement, and when I saw a friend posted about them taking over her loan I logged onto their website and registered.  The payoff balance on my car is $19,000 as they report.  They show 44 payments have been made, yet I had a auto dealership run my credit report and they are reporting 53 payments paid, with 19 remaining.  There is no way the balance should be $19,000 on a car purchased brand new in 2006 which was financed for $27,000.
I questioned them, they claim the dealership and manager wasn't looking at my credit report right.  They accuse me of lying about every point I have made and lies they have been caught in. 

I requested a detailed summary of my account from 2006 til now, including all payments and how they were applied.  I am still waiting on it!  I looked online and found 8 payments which 100% of my payment went to interest, and 0 to the principal.  The amount applied to interest has varied drastically.  There are late fee's applied to almost every month, when my payments were coming out of my checking by autopay(no way they were late).  When I changed banks, I started sending money via Money Gram.  Citi lost 1 payment which I mailed a money order, even though it was cashed they claim they didn't get it. That is how I switched to paying with Money Gram.  They are extremely rude, the account "Managers" can't answer a simple question when confronted over the credit report and the difference in the payments posted that they are shhowing.  Their excuse was " I have no idea what he was looking at as I can't access that personal information" when I asked them about the credit report.    I never received a notice that they had transferred my account from Citi to Santander.  It's a big cluster!