How do I file a complaint with the ME state bar association for unethical behavior of my former attorney

Unethical behavior: Had a bad experiance with a former attorney which was used several times in family matters. Twice before we entered into an agreement, the third time an agreement was overlooked. During the last matter he started to become distant and almost missed an extremely important emergency hearing. Shortly thereafter he pursuaded me to take a deal by indicating we would be better suited to proceed from there. The next day he withdrew from my case and sent a demand for services which I felt were not received. I disputed these charges, which brought us to Small Claims several months later. During that trial he misrepresented himself by saying that the billing he was sueing for was for the first two matters which were settled and paid for years ago, and that the recent matter we was doing "Pro Bono". In a nutshell, the man lied in open court to hid the fact that we did not have a written agreement. I want to pursue this, but need a direction.

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