How to severely punish that bitch and heartless man?

Be calm and remain calm, and try to transfer business funds as much as possible (the name of the license holder is the key)

If you want to punish him, keep calm and silent, and try to get their extramarital affair evidence and file a lawsuit with the court.

If the above are stable and moderate, divorce is inevitable. Live well and happily in the future, and strive to live with your son and educate him well.

As long as you live better than him and are happy, the punishment is better than if you kill them.