Why do they not return people's deposits? How do we file a fraud claim against this company to ensure they don't eat everyone's money?

I rented a car for 2 days at the airport on March 25, 2019 and to this day they have not returned the deposit of 250 dollars that they charged me for my card, they promised to return it within 15 days of returning the car, I have called by phone, sent mail, and no one answers me they do not take care of me. I'm going to sue this company for fraud. A shame. Does anyone want to join this?

Dear customer we apologize for the inconvenience. May I have your reservation number or Mia - number ? We can try to maintenance it out to you at the earliest. U-Save Car and Truck Rental Customer Service Team