There is a charge for installing security window.

This kind of situation can be complained to the industrial and commercial bureau. The administration illegally accused you. As long as your installation does not exceed the decoration management regulations, the management office has no right to manage it. As the owner, I will never charge these fees to the owner. As long as you are within the scope of the renovation management law, the management office will not interfere in the renovation process. Even if there is water seepage in the future, the management office will not charge you. At that time, he will say that you installed the security net yourself and let you pay the fee. You can keep the evidence or sue the management office.