When your car was sold at auction, I know it was not sold for the amount you owe.
The difference between what you owed, and the amount they got for the car will still be owed by you to Wells Fargo Bank.
They will have the right to sue you to collect the remaining balance due on the loan.
Save that money that you got to pay off your loan, because once the apply the proceeds from the sale of your car to your loan, you will need that money to pay off the remaining balance.