My husband and I hired a local company to pour our driveway. We'll call him "Mr. Fix-it". Mr. Fix-it poured our driveway as we agreed, did a good job and we paid Mr. Fix-it the full amount per our agreement. Today we received a letter from the concrete company stating Mr. Fix-it has not paid the balance of what he owed them. They advised that they will put a lien on our house if the balance isn't paid. The letter said Mr. Fix-it is not returning their calls. They asked in the letter to contact Mr. Fix-it to get him to pay. I called and advised that they cannot file a lien against our home because the agreement was between Mr. Fix-it and the concrete company. Their agreement has nothing to do with us. Am I right?