Citibank Credit Card Complaint

Citibank Credit card department,

Billing disputes Texas

I rented a car from a - at - that put a hold on my card that was equal to over 5- the cost of my rental. I was informed that when the car was returned that the hold would be released immediately. When I returned the car I verified with the merchant that they had released the hold and I had a conference call with the credit card company so that they could verify directly with the merchant via the transaction ID that the charge was not valid and that they could release the hold however the credit card company refused to do so. The credit card company was AT & T Universal Card and I have been a card holder with them for 20 years and they refused to even issue a pending credit back to my card to allow me to rent another car which was needed for a trip out of town despite verifying directly with the merchant that the charge that was in their system was not valid. I consider it fraud to hold a credit on an account that is not valid and can be proved not just via paper receipt but directly via merchant.