We started a roofing job on 7/12/2019 for $60,000 on a large home in Pennsylvania. After completing 95% of the job, the homeowner began complaining that the materials being used were inferior. Then, as of 7/23/19, the homeowner would not allow us to return to the property and finish the job (the job is unfinished and there is about $2,500 worth of work remaining as of today). There is a balance due by the homeowner of $10,000 on the job. In January of 2020, the homeowner filed for arbitration with the AAA. On 3/18/20, the Arbitrator denied the claim, finding against the homeowner, and the arbitrator closed the case. We are now trying to collect the balance due of $10,000. The homeowner is arguing we had to raise that as a counterclaim in the arbitration, and our failure to do so waives that claim. We disagree. What are our options at this point for collecting the unpaid balance? Can we file a lien?