If you notice during the trip that you will be late and cannot return the car within booked time, inform the service centre immediately (069 . 5899 622 22). If an extension is not possible due to a follow-up booking and you still return the vehicle late, we will charge a lump sum for the cost of rebooking the following customer. A higher flat rate will be charged for delays without prior notification of the service centre. In 90% of cases, you can easily extend your booking with a timely call and only pay for the extra time.