If you have any genuine complaints..
..arising from looking after your son and any contact you are required to have with the ex because of your son, go to the social services. If you are not required to speak to the offensive parties and are being harrassed by them, get a restraining order.

What will petty vengeance achieve? Sure you could get phones bombarded with calls replying to some ad you've posted (say) but it seems like a lot of time and effort, and stress for not a few people, and all for nothing eventually.. what's the point?
(raymond "three griddle pans" luxury yacht lovin' the christmas action, Mon 12 Jan 2009, 12:57, Reply)