Deducting money after return!

Not a trustworthy company due to vehicles not being 100% and in good condition. Also deducting money from your deposit as they see fit, for example deducted R700 "exchange fee" for a vehicle I took back that was NOT licensed! I was never informed when I took the car, only pick it up when I wanted to enter a complex and security refused me as the car license expired 6 months ago, and after I had occured costs driving from Cpt to Malmesbury to exchange! NOT ON!!!!!