I love the irony in the Goldcar Rental twitter handle: @goldcarcares They are a bunch of incompetent idiots who refuse to take responsibility and blame it on "The Computer" who told them so. Avoid their Rome Airport branch like the plague.
I will be posting a public reviews of what happened and raising a formal complaint your customer services. I have also encouraged @arguscarhire to stop doing business with you. Certain people should not have customer facing jobs, and Marco in your Fiumicino office is one of them!