We have been given notice of a lien against a property that we own. The notice was sent by email only. no certified notice was received. The contractor has been paid in full for all work preformed. After he received full payment on the contracted amount, he wanted more money ($900) to pay him for the work he would not perform in the spring. If we did not pay that amount, he would file a lien against us for over $4500, which he has now done. He is not licensed in Minnesota were the work was performed. What are our options?....