We own a home in Missouri and were going to rent it out to this couple. They had signed a years lease and were to move in Jan 1st 2008. They were told that the house would be cleaned and ready for them on that day. They wanted it to be cleaned and ready before that so they offered to clean it themselves. They had not paid any deposit nor rent when we heard from the mortgage company that we could not rent it. They are saying they want 1,000.00 or they will take us to court and sue us. Can they do that?