The worse administration in the world :Deposit unfairly withheld

Whatever you do avoid any property that is managed by CSI property management, they recently took over from Central development at San ridge heights apartments and it has been a nightmare since I moved out, the have withheld my deposit and are charging me unfairly for a unit that was not cleaned and painted when we moved it , I tried explaining this to them but they insist on charging me for normal four years of wear and tear , move in knowing that they will not give back your deposit and if you have issues they will not handle them