I had something similar happen to me, though it was far more frustrating.
I was working with a client who owned a small company and I went to her office because I couldn't get a hold of her on the phone. Payment was delayed and I was getting frustrated, though I was trying my best to keep the peace and be 'nice.'
Anyway, when I arrived at her office, her employees managed to contact her on the phone and she said she would be arriving in the office shortly. I was there for maybe around 3 hours, when she called up her employees and told them to tell me to just come back the next day, with the worst explanation ever - none! I got the phone from her employee, before she could put down the phone and tried to keep composure while my tone and words obviously swirled with irritation. She apologized, but kept on saying to just come back the next day.
She kept this up for two more days until she finally paid up.