Shocking claims and deposit withholding..

This is the second consecutive time hiring a small car from Europcar. We received the car in the dark.. No one shows us where the vehicle is or walks around checking the vehicle. We receive a pdf emailed of supposed faults after we are driving away. Then on return the guy walks around the vehicle... Says nothing and requests a signature. Later we receive a mail with a claim for damage on the roof!??? This little vehicle was parked in secure parking at all times. Now they keep my deposit again!! The second time round!! After supposedly finding damage on the roof After we handed it over???? I think this is bad customer service and they are ripping clients off!