One of my customers is refusing to pay for the final cut of 2001. She thinks that she cancelled on 10/19, but she really cancelled on 11/7. We use Clip so we have good records of jobs done and entered. I have sent her a copy of the final 2 route sheets with her schedule dates. We have our in and out times recorded for the 19th and yet she believes that we are wrong. She has nothing to support her claim. We have detailed route sheets and the foremans hand written notes to support our side of it. We are confident that we are correct. The invoice is only $55 so should I pursue this further and risk that she will not be a customer next season or just let her think that she is correct?