Im the co owner of a general contractor construction company, our firm completed an interior home improvement job in city of diamond bar, CA to a couple clients on or about 12/14/2020 to 1/29/2021 . The owners failure to pay $ 20k included materiel with the proof of receipts to us. I tried to ask them to pay via email, text messages etc in properly languages, the owner did runarounds with us, also bullying and threaten my firm, and asked my firm to continue to do some cosmetic repairs to their premise. I asked the owners to pay off arrearages first, then I would to help to do extra touch up or cosmetic repairs. But the owners refused to and not reply to my inquires any more since on or about 2/19. on 3/5 , I received an attorney letter form this group of owners, they asked my company to credit them $10k.... In this case, should I file a mechanic lien or work with an attorney to fight for my justices and right ? Thank you so much. If so, I will!