Completed a project that was substantially completed earlier this year where we requested the final invoice to be paid. They were past their 30 days of payment when they advised us the fans installed did not work to their satisfaction. We agreed to fix these and provided additional fans to increase the air flow they wanted. The re-work has been completed as on June 28. We allowed them to work with the fans prior to requesting final payment. They now advise us the fans provide to much air which entail has to much wind noise and do not want to pay for this portion of the project (which is the outstanding balance). They have stated that the new work does provide the quality of airflow however are not happy with the wind noise (which is only at maximum level and it’s 17 fans set on 6 variable speed controllers), this is their reason of not wanting to pay. We the work provided was on the original contact, the fans were requested to provide air flow during the hot Arizona days under a covered arena. We would like to know if we are able to lien this project.