If a Structural Enginner submits a false certificate against me stating that I have damaged the structure of the building while renovating my flat. Also being aware of the fact that I had taken necessary certification in writing from another Structural Enginner that the procedure I am following is not harming the Structure of the building. Now I have managed to get the original building plans which prove that the engineers had certified falsely ignoring my engineers certification. Assuming that I have all the necessary documents to prove him a culprit, how severe a crime can he be sued for ?