REALLY BAD SERVICE, ATTITUDE AND BILLING

I RENTED A CAR FROM EUROPCAR ON THE 10.03.16 AND RETURNED 11.03.16 THEY GAVE US KEYS AND SAID GO UPSTAIRS TO THE LEFT WILL FIND CAR THERE, WHICH WE DID BUT NOBODY CHECKED THE CAR WITH US, i SAW A LIGHT SCRATCH ON ONE SIDE AND ANOTHER SMALL DEEP SCRATCH ON THE OTHER SIDE, BUT THINKING THEY ALREADY KNOW ABOUT IT AS IT WAS LATE WE LEFT. THERE WAS A SLIP INSPECTION SLIP IN THE CAR BUT HAD NO CUSTOMER SIGNATURE. WE RETURNED THE CAR AND WERE TOLD THAT WE CAUSED THE DAMAGE WHICH IS NOT ACCEPTIBLE AS IT WAS THERE. EITHER FROM PREVIOUS PEOPLE OR FROM SOMEONE IN THE PARKING AREA. WHY MUST I PAY FOR SOMETHING THAT I DID NOT DO, OR NOT EVEN INSPECTED WITH BEFORE WE LEFT. I PHONED AT THEY WERE RUDE. I AM REALLY FURIOUS ABOUT THIS AND WILL NOT RECCOMEND EAROPCAR TO ANYONE.