I was hired by a client to develop a membership website. The scope of the work, timescales, deliverables and my fee were agreed and she even paid a deposit up front. 

A couple of months later, on completion, we had a meeting where I demonstrated the application to her and we went through it thoroughly. A few days later she signed off and paid the remainder of my fee. She was a happy client (or so I thought).

Six months after completion & launch, she contacted me stating that she was not happy with it and demanded a full refund. I refused. She then sent a letter stating that if I did not give a full refund by X date, she would be getting her lawyer involved. Again, I refused.

A few days after her deadline I received a text message:

Client: On my way to my lawyer’s office now. Is there anything you wish to say?

Me: Yes. Good luck.

I did not hear from a lawyer, but the client contacted me a couple of weeks later, asking whether I was in a position to do more work for her!