Me and my girlfriend had a couple move in with us. We do not get along at all and it was decided around a week (nov.24) ago that they were going to move out. We found another person to move in and take over the rest of the lease. This person can't move in till mid January. They promised us to pay decembers rent. Today I found out that they are not going to pay decembers full rent and they are not paying januarys portino either! Is there anything I can do?