I was contracted to do a major update to The Bristol Language Centre's service brochure. After the initial project meeting, we ascertained it was a relatively large amount of design and copy changes, and I sent an estimate which was approved. As the days went by, Seonaid kept changing what she wanted done, and kept sending me last-minute urgent change requests during the final 3 days before the design was going to print.
This took up a large amount of my time on other projects, and all of her changes were in addition to what had been initially outlined in the project description. I warned her that she would continue to incur further charges as long as this went on at my hourly rate, which she agreed to verbally over the phone.
During subsequent phone calls, I quoted the amount she owed to-date, which she agreed to, and again warned her that her bill was creeping up. She said she wanted to continue because she needed to get it done within the deadline for print.
When I sent her the final invoice, I did not hear anything back for 2 weeks. After 4 weeks I sent a kind email to remind her a payment was overdue, and to ask about how the design had come out after printing. I had no reply. 6 weeks after billing, I sent another more firm email reminding her payment was due and that she was going to incur late fees, and had no reply.
I have not heard from her since, and she has not returned my voicemail messages, messages left at her desk, or email messages.