Hoosiers filed more than 15,000 complaints with the Indiana attorney general's office last year.
Auto-related grips topped the list again.
Complaints against retail stores and home contractors were among the fastest-growing categories.
The newly released information comes right after the National Consumer Protection Week kicked off Sunday.
Attorney General Greg Zoeller said, “the more you are informed, the better your chances to avoid becoming a victim of a fraud, scam or bad business transaction."
This Thursday, Zoeller will host a roundtable discussion on how to crackdown on scams and deceptive practices seen across the state of Indiana.