I am surprised, that you in this late stage of your business, do not file notice of/to owner or notice of commencement papers with the clerk of the court. I always win in court based on just those papers, if they are unhappy with our work, then they can re-sue in a separate case for them thinking that the job was done poorly. I almost always go with a lawyer, and when it comes time to settle the consumers claim, we file a motion to have the original claim of not paying that was decided in another court, that way they can not say that they didn't pay, cause a nother motion is filed and usually granted, making the ruling to enter the original case knowledge and proof of payment as fact, But during the consumer lawsuit they can not question or analyze that judgment that we got against them, thus making the consumer hand tied, after all we can represent the ruling in our favor, but the can never say that they paid it under pressure from the courts, so they have to get a jury or mediator to listen to the reasons why they thing that they deserve to not pay us or ask for damages, since they have already been served a judgment in our favor from the original case of them not paying, so trying to explain to a jury that yes we paid the company, but did it under protest, and that comes back to the fundamentals of theirs case, where as they are not allowed to issue statements or speak about the judgment that we have on them. 97% win all with judgemnts against thier property, bussiness, and what ever else we can attach to. And if the person is a franchisee we go after that comany as well.
Good Luck