Very disappointing experience and feel cheated.

The staff behind the counter had told us that she will charge us an additional 100 euros for a second driver. Even though we did not agree as we did not think it mattered how many people drove the car, in any case due to no choice we agreed and took the car. They had taken a deposit of euro 594 from my credit card and mentioned that they will return euro 400 when the car was returned in good condition. However when we returned the car and got a no damage on the car while being returned, they have still only returned euro 229.04 to my credit card instead of euro 400. This is unlawful. They are not picking up the toll free numbers that are listed and we have no way to talk to them. I am very disappointed.