I am senior citizen with low income. I live in Missouri and I was approved for a grant thru USDA Rural Development to have new siding put on my house. Supposedly the contractor USDA chose did not estimate everything that I wanted covered with siding so I asked the contractor how much extra it would cost. He said $350 so I told him to do it and I paid him $350. Now he claims I still owe him money even though USDA paid him for the job and I paid him for the additional work. He has threatened to put a mechanics lien against me. He first said I owe him approximately $500 more and then second he said I owe him approximately $700 and he wants me to pay him by March 15, 2023. I don't think I owe him any money. I don't have any contract for the additional work other than a text message from him and me to him confirming the amount of $350. He did not give me a lien waiver. If he does file a mechanics lien against me what steps should I take to fight against this lien? Thank you! Vicki M.