Car wasn't cleaned properly before my rental, car was in poor condition, agent tried to rip me off

The agent on site, Robert, despite making me wait 15 minutes at the airport for pick-up, was pleasant when I picked up the car, presumably as he was trying to up sell me all the various extras. The same individual was a completely different character when I dropped the car off. When inspecting the car, he almost immediately pointed out a scratch on the back-left wheel arch which he conveniently failed to find when I picked up the car. His immediate reaction when I said the scratch was did not occur during my rental was that it was not on the check-in sheet, therefore I was liable for the repair, and would therefore lose my €2,100 excess. The speed at which he went for the back-left wheel arch suggests he knew the scratch was there already. Presumably he is on commission to encourage him to charge customers. Luckily for me, I took photos of the car when I picked it up so I was able to clearly show that the scratch was on the car prior to my rental, much to his visible disappointment. The car I rented had numerous scratches on it. It was not cleaned properly ahead of my rental, inside or out. The attitude of the agent was abysmal. The fact he attempted to scam me out of my full €2,100 deposit left me feeling indignant. In future I won’t make the same mistake by using Easirent. I’ll be sure to use Thrifty, Budget or one of the other more reputable rental companies. I’ve been renting cars regularly for 15 years and I’ve never had such bad service. I would suggest you reconsider using this company going forward. Clearly I’m not the only customer who’s had an experience like this; https://goo.gl/maps/8XZgawzKfU25ZSTU9