We are on the National Do Not Call List. The caller asked to speak to the owner of the house, so I suspect they were calling blindly as they didn't refer to us by name. I asked who is calling, and he identified himself as a business offering duct and furnace cleaning. I let him know that this is an illegal call as we are on the NDCL and we have never been a client of their company or any other like it. He said "oh" and hung up