Sixt Nashville TN downdown is a cheater

I would like to report to scam of Sixt Car Rental located Nashville Downtown, 532 6th Ave S, Nashville, Tennessee, 37203-4235. I rented a car on April 23, 2026 approx. 4pm at the above location, I checked the car and take a few photos before driving the car away to record the damage on the car. I returned the car same day April 24, 2026 approx. 11:15pm at the same location, parked the car, return the key to the key box, there is no new scratches or damage to the car. I returned the car early because I was staying in Nashville downtown and there is no place for me to park the car and I also have meeting on April 25, 2026. On April 24 @ 6:57am, I received the return receipt from Sixt Car Rental, confirmed no new damages on the car, There is a name on the return summary - Carlos B. On April 24 @ 8:59am, I received the formal invoice from Sixt Car Rental, confirming the final charges of the rental. On April 26 @ 10:34am, I received an email from Sixy, saying there is damages to the car, resquesting me to respond to the new damages, then I respond right away, stating I was not aware of the new damages, I returned the car on April 23 at 11:15am, the office confirmed no damage and sent me the invoice, however, now the daqmage report sent me over 48 hours after the car return, totally unfair On Apirl 26 @ 10:57am, I received an email from Sixy, confirming they received my response, they are looking into the information. On April 28 @ 8am, I received an email from Sixy, stating the report repair is 1250.93USD. I found this company is unbelieveable, confirmed the no damage to the rental car next day then report another damage after 48 hours of the return? Why the client was being blamed for the damage, how the company prove I was the one to caused damage while the car was in their procession for more than 48 hours after the return. Totally unacceptable. So far I have reported to RpoertFraud.ftc.gov and BBB USA, also left a one star review on google for this bad company, if anybody can offer more advice...will be highly appreciated.