The barrier exit system was not functioning properly and we had difficulty exiting the car park. This was exacerbated by the on site staff who did not seem to have sufficient common sense to resolve the situation in a timely fashion and did not follow the protocol set out in the parking instructions. In particular they did not answer the call button at the barrier exit which we pressed when the barrier failed to open. Instead we had to get out of the car and go to the office, joining a long queue to get them to manually validate our ticket for exit. Since our car was parked and blocking the exit (and blocked in by other cars behind) nobody could go anywhere until our ticket was processed. If the staff had answered the call button and taken our reference/details as per the instructions it would have been a much faster resolution but they seemed overwhelmed by the issues they were having and unable to go about resolving them in a logical way. An unnecessarily stressful end to our holiday.