my central air was acting up and i knew i was going to need a new one . i called a place and asked them to send someone out to tell me how much it would cost for a new one. they said they thought they were doing me a favor by repairing it. i signed nothing for these repairs i was not even home at the time. they keep sending me bills with interest on them. by the way a week later the unit blew its last breath. spent 1800 for a new one ,not the same company. do i have to pay these people?