Should our former management co wants to take a"cleaning fee from our security deposit is that legal??

We've moved out and have our receipt for house cleaning (my mom and I live there for five years ) left the house very clean but the management company wants to charge us $400 for my security deposit for cleaning we told him this is not legal but they are insisting withholding $400 From our security deposit because it wasn't clean enough for them we also have pictures and witnesses is there a legal stature number that I can give to them to prove my point that it's illegal for them to do so if they did not include this service charge at the beginning of my lease