Avis Frankfurt Airport Has Not Refunded My €103 Deposit

I rented a car from the Avis office at Frankfurt Airport from July 2 through July 6. During the rental process, a €200 deposit was charged to my credit card, and I was told that €103 would be refunded after the rental was completed. However, I have not received this refund. Instead, the amount continues to appear as an outstanding charge on my credit card, and I am expected to pay it.

I visited the office and reported the problem in person, but I was only told that the process could take a long time. I did not receive a clear or solution-oriented response. My credit card payment deadline is approaching, and I am being unfairly inconvenienced by an amount that should have already been refunded.

I am requesting that Avis review my account using document number 691126601 from the Frankfurt Airport rental. The outstanding €103 refund should be credited to my card immediately, and the incorrect debt should be removed.