I want to get back at the bullies
I'm curious as to how you plan on getting back at your bullies?
I found someone that I am paying to bully them back.
Even if someone bullies you, hiring someone else to bully them back just creates a circle of violence. Forgive your bullies and find compassion for their misdeeds, but don't engage in bullying yourself.
I'm not intending on anything illegal and there's nothing wrong with this.
There's nothing illegal about it, but it is extremely lame of you to pay someone else to fight your battles. Meeting violence with even more violence is how you create a never-ending battle with these bullies; it would be best to find a less dangerous way of handling things.