Mods kindly take this to the right section if this is not the right place

For some time now my new neighbours who stay
across the street have been coming to ask me for
their football which they often kick over to our compound.

In fact yesterday when I saw it I came out of my compound
and threw it over their fence myself without their asking.

Before now they'd once come 3 days after to ask for it
as if they were afraid to come the day it happened,
not knowing that I didn't even know it had entered our compound.

The first time it happened I cautioned them that there are
cars, windows, roofs and other delicate things within our
compound that they must be careful about.

One of the guys living in our compound once threw a
heavy object towards the window and broke it
He had to replace it.

I'm not hoping for any negative circumstance but what
would you advice that I do next time their ball comes
into our compound?

I don't want anything to be destroyed first before
this frequent happening is stopped.

When I stayed in my uncle's house in Gbagada way back
he never agreed to throw the balls back but instead tore them.
I used to throw them because I felt it wasn't done deliberately.
But sadly it didn't go well because my uncle had about 3 cars
parked inside the already tight compound.

What would you do?