First, the actual rented car was a diesel vehicle. During use, it suddenly showed a need to add AdBlue, otherwise it could not run normally after 100 km. After inquiring with customer service, I was told to buy AdBlue myself and then get reimbursed by the rental company. It took a lot of detours and wasted fuel to purchase AdBlue! Finally, after an hour, I bought it and got a receipt from the store (Total gas station). When returning the car, the rental company did not accept the receipt, claiming it did not list the AdBlue product name! We provided all evidence: a photo of the AdBlue warning displayed on the vehicle on the day of travel, photos of the purchase, and photos of adding AdBlue at the gas station, all with time stamps matching the receipt. We are still appealing and there has been no progress so far...