GoldCar Rental / unauthorised payment taken from credit card

I rented a car pick up Bologna Airport on 10 September 2018, return 18 September 2018. This booking was through Rentalcars.com and the booking reference is [protected].

The process and rental was trouble free, all payments were made and subsequently I got confirmation that the contract was closed.

However you have just taken an unauthorized payment of 55 euros from my credit card in the past few days.

I would like this money refunded. Can someone contact me to confirm that this will be done.

Paul Adams