We had a verbal agreement with a contractor to do some land clearing. Before he was finished doing the original scope of the work he said we were already at the verbally agreed sum and it would now be more to complete the job. We decided we wanted to part ways and paid him 80% of the original amount which was more than fair for a job not completed. (We paid him $4000 out of $5000). He has now threatened to put a lien on our house. I am wondering if he can even do that since he never provided us with a Model Disclosure form? We repeatedly also asked for him to provide the costs in writing and he would not provide that. Thank you.