Let's say you have a client who refuses to pay you because they left and went somewhere else, claiming that the work was done incorrectly, but not offering specifics about what was incorrect...
You have a signed engagement agreement saying that they will pay you for your work if the tax return is prepared but the client decides not to complete it for some reason.
You have tried to politely reason with the client, ask for the specific errors, and explain the agreed upon engagement.
What's the next step?
Drop it?
Send to a collections agency?