That was my day. The client booked me for a specific task. This didn't happen. Rather than send me home unpaid, and annoy the agency, they stuck me in the lounge with no 3g, wifi or aircon in the vague hope that "somebody might not show". I ran out of change, phone battery and even farts. Eventually they let me go, and I had to cycle 12 miles in a random direction before I felt human again. Tsk.