My dad's neighbour have about 50 cats in the house.
The owner even hire 1 indon maid just to take care of these cats

When the wind blow towards this direction you can just smell her cat house.  And at times you can hear the meowing non stop

Everyone talked to her before, even reported to city council but not action. 

Dad no choice but to get his contractor to build a high up wall to block the smell and noise.

still can, but cut down a lot.

those cats that frequently come over and kacau, we solve it by trapping it using a trap cage. 
then release it far far away.  we usually drive like 5KM away and release it else where.