Stay clear from this poor service mentality staff

Very poor service, We booked to leave for an event at 6h30 in the afternoon to a venue and asked to come back at 11h00 after the event. They said because I booked the return as 11h00 I booked wrong. Why would one book to leave at 6h30 in the after noon and return 11h00 the morning back on the same day, it makes no sense and any good service provider would have picked this up and called the client to re check. We booked days before. The reason they do not check this is because they make money out of your mistake, telling you on the day an hour before the time that you booked wrong and now must pay more money. The manager Sonja told me that they work according to the system and cannot do anything to prevent such poor service. So they manage and service a system, not their clients. Very poor service, we cancelled - please stay clear