I retained a contractor to install a subfloor an agreed to pay the final installment upon completion of the work. the work is far for being finished but the contractor now says that garbage removal, installation of tecos and straps, installation of a support columms etc are punch list items that he would complete after full payment. He also added an extra 4600 to the contract without my approval. another change order was well documented and paid. I have written to the contractor that I would pay him once the work is done. He sent me a bill for 9900 including the disputed item asking for payment that evening. I refused and he filed a lien this morning. I have no idea what it is wrong with the contractor. I am willing to pay but want the work to pass the building inspection which the contractor wrote it could not until some items included in its punch list are addressed. To me this is a clear case of malicious lien. What are my options?