<prompt> Human: I have searched the internet and I cannot find any information on this. My sister bought a car 3 years ago for 16,000. She has bad credit. She has been paying her car payment though. She is telling me she is at 19 interest rate. After 3 years, her principal has only gone down 1000. That seemed to be at the beginning of the loan. Looking at her statement, she has been paying 0.00 towards the principal each payment.She called the bank and said she has a simple loan. Ive never heard of such a thing. Has anyone heard of this before?Edit: Here is her statement. It has been edited to protect identity.  <response>: Your sister might as well have bought a car on a credit card. She needs to refinance if at all possible. 