I have received a parking ticket, stating that I had - "Parked after the expiry of time in a pay & display car park."

I appealed stating that I had paid £1.00 and the machine must have a log and they declined the appeal stating that the car park closes at 18.00 and that the pay and display ticket would only have printed until 18.00.

I am at a loss as to how they can have suffered "losses" in a closed car park? Also the T&C notice did not state that parking after 6pm and before 6am was not allowed - only that parking after the expiry of a ticket would contravene the rules. Is this a new parking scam?