No refunds are possible. If you do not return the car within 24 hours, you will be charged for an extra day. It depends on whether you can return the car outside business hours ?
3 Answers
Contact the car dealership
Just tell the local car rental shop. They will charge you extra money if you rent a car outside of business hours. Greeks are pretty mean.
Out of business hours, you need to confirm in advance, and then... add money.