It would be advantageous to see the signs as it may be of great assistance. There is normally a 5 minute acceptance period prior to parking. Can you provide the opening times of the premises as it seems quite absurd that there is no opening times given on the sign if that is the case. You can appeal and the parking company will no doubt submit the signs on site to prove they have issued it correctly.You can still be a pending customer until you are advised the premises are closed. Do not under any circumstances name the driver.