When we arrived at the store, our reserved car was no longer available. There were only two cars left, an Audi and a Volvo. They gave us the Audi, and later, when returning the car, they tried to charge us for a vehicle upgrade, which we refused to pay. When picking up the car, the staff told us that returning the car with less fuel would be calculated accordingly. However, when we returned the car with two bars less, we found out that if the tank is not full, they charge for a whole tank... This resulted in over 1000 RMB extra.