Do we go by old landlords lease that is signed or new landlord's unsigned? Please help!?

A yr. ago, we signed a rental lease w/ our land lord, in which, 4mths. later he sold the building. Our new landlord gave us a lease, but we never signed it. Therefore, we are movin out a yr. from the original signed lease. At the present, he knows we r movin end of the mth. but we are late on our rent. He wants in 3days w/ late fees. Plus we asked when we move will we be gettin our $500. deposit, since everythings in order. That's what the signed lease states. But his states u get $300. & he keeps $200. for cleaning. Whose lease do we go by? & Really should I have to pay the late fee?