A mechanic's lien was placed on my property stating that I am still owing the final payment. Since then, I found out that the two related contractor's that I hired, did not have the proper licenses to perform the work and that the license was strictly renewed (considering the date of the mechanics lien and date of renewal) just for that purpose. The contractor filed the lien knowingly that the work was performed during his unlicensed period. This is in the District of Columbia. Was this a fraudulent or frivolous filing?