I hired a construction worker. he have me an estimate that was acceptable. i never signed the estimate, and after a 2 week period, he changed the

estimate to an additional $1,000.00. The work has not been completed, and now he is threatening to put a lien against my property. I am doing this work to sell my home soon. I already paid him $3200.00, and, offered him a check for $1000.00. to close this out with him. He refused the check. I sent him the check, Return Receipt Requested, telling him to accept the check within 3 business days as a final payment. The work is not completed on the house. I intend to deposit the money back into my account if he does not accept this. this check would bring the amount I paid him to $4,200.00. The original estimate was $4,854.15. The incomplete work totals roughly $700.00 of the original price. This is according to his own estimate. Will this screw up my home sale? Can I counter this activity ? He came back and reduced the price. but, The work is not done and there is a principal here. I need some direction. Thanks!