Almost new car

The car was amazing, it’s my first time in the last years that I ordered a car and I really received the car that I booked

1. When I arrived at the premises of Europcar in Athens to get the car, they asked me to block an amount of deposit 10 times the amount indicated in my contract (3000 euros instead of 300 euros). I did not have 3000 euros available on my credit card. Then they asked 5 times the indicated deposit amount (1500 euros) but, at the same time, I had to pay 50 euros more for the rental than the 88 euros indicated in my contract (138 euros instead of 88 euros). This is clearly a breach of contract. I had no means to rent another car, I was with children and this was our last day of holiday so I had to accept it. 2. The car I got was in a rather poor state, full of scratches. 3. After returning the car without any problem, they did not unblock the deposit of 1500 euros from my credit card for 3 weeks. I called them twice, to no avail. A lady at the client service assured me both times that her colleagues most certainly had done all the necessary to unblock the deposit and that it was probably my bank's fault if it was still unblocked. Then I called my bank with which I have never had any such problem (and I rent cars often). Europcar had never unblocked the deposit. My bank did it for me since it was not claimed for 3 weeks.