Enterprise Rent A Car Failed to Reimburse the Key Deposit

On September 10th, I drove away in a vehicle that I had rented from the Montenegro Podgorica Airport. Aloma took a deposit of 690 euros from the account that was linked to my debit card (the deposit was not blocked on a credit card). They still haven't refunded the deposit, and it's been two months since they took it. Despite the fact that I've sent them multiple emails, they insist that the money has been sent, but it still hasn't arrived in my account. The current circumstance is causing a great deal of frustration. Could you kindly expedite assistance in order to resolve this matter as soon as possible?