Hello, More than one year ago, I hired a general contractor to do some remodeling in my house in Colorado. The project had different phases. For the first phase of the project, we had a contract, and he completed the job in mid-November 2018 and got his money. For the second phase of the project, although I insisted on having a written contract, he refused. After a few weeks into the project, he and his team (2 people) were mostly absent with different excuses. It was evident that he was not that interested any longer in doing the job despite our consistent request that we needed to get the job done as fast as possible. He told me that he'd found a better job which was going to pay him more. After putting up with all his delay and long absence, he was supposed to come back to continue our project on January 8, 2019. However, surprisingly, the night before, just around midnight, he sent a strange email with an absolutely nonsense invoice asking for about $10k. I wrote back to him that this didn't make sense, and I could not work with him. At the time, I was so angry that he left my job incomplete and wanted to sue him, but didn't have any contract or evidence. After one month, in February 2019, he sent me another invoice (called it a revised invoice) asking for $3k instead of $10k. He is asking for money for the job that he didn't complete. I asked him to come and finish the job, and I'll pay him based on what we had agreed before the start of the second phase. He didn't come and later on sent me a few emails asking the same thing. One week ago (after more than one year), a debt collector contacted me, and now he is threatening me to put a lien on my property. Unfortunately, we don't have any contract, and almost everything was verbally agreed upon. I appreciate your advice on how to deal with him legally.