The Contract is No16310646.During the payment, because we have only debit card and not credit, you charge us 750€ extra as a guarantee on 12/08. You will return us this amount, when we will return the car on 19/08. But the refund did not happen. We communicate with your telephone center and your colleagues told us that you deposit 750€ in 19/08. But the principle of the National Bank of Greece told us that you really try to deposit this amount on 19/08, but the transaction rejected with the reasoning : chain not found, credit. So you have not return us the amount of 750€ yet. I will attach you the movement of the transaction, that prove this. I hope to understand our problem and deposit again this amount so this case finally come to an end. Thanks in advance