Having prebooked online, on arrival at the car Park, The barrier would not open and there's was no button for prebooked cars to allow us entry. We therefore just had to take a ticket and park. On return, the car that was parked opposite us, a black land rover reg BE13 NDA, had bumped into the front of ours and was still touching our car. When trying to leave the barrier would not open and wanted full payment. We had to visit the office to explain we had prebooked, so we could lexit. We mentioned about the other car and was just told to leave a note on the car. A very annoying experience for what we thought should be straight forward.