Santander Consumer USA Consumer Loan Complaint

Santander Consumer USA Consumer Loan department,

Vehicle loan Problems when you are unable to pay Problems when you are unable to pay Puerto Rico

I cosigned a car loan for my sister and due to lack of payments ; I ended up calling the finance company, which was - bank to repossess the car. Couple to few months later, I received a letter from the bank stating that they sold the car and it was sold for $4000.00. From that point, I requested documentation that proved that the car was actually sold for what it was sold for. The car was a - - -, limited edition. All I received from - was an itemized list ; I strongly believe that the car was worth more than what the bank claimed it was sold for. I know a creditor may have the right to " repossess '' - or take back your car without going to court or warning you in advance. The creditor may also be able to sell your contract to a third party, called an assignee, who may have the same right to seize the car as the original creditor. I was never informed about the time and place of the auction or private sale. I 'm convinced that the selling price of the car was below the book value. I strongly believe that the bank failed to resell my car in a commercially reasonable manner, and I need answers. As of today, I owe more than $12000.00 and it is being reported in my credit. Please help me.