Car not available after being booked and paid for

I am deeply disappointed by the service I received (rather I didn't receive). I booked a car to pick up at 7:15am (Birmingham International Airport) and when I arrived there was no car for me. It is already paid for.<br> <br> The employee (Simon Mahli) said there is nothing he can do and will call security if I don't leave the premises immediately (remember I have paid already).<br> <br> What kind of service and business is this? I was stranded at the airport and missed an important meeting. On top of this I must call and get my money back from head office. Is this fair?<br> <br> There is no manager on site and when I asked the employee to call the manager his reply was \the manager doesn't like to be disturbed when sleeping. "