Let me tell you a quick story. A few years ago, I had exactly the same problem.

There would always be one or two pupils that challenged my classroom management, who refused to follow to my instructions (however reasonable).

Worst of all, my heart would fall when those same children stopped and listened to certain other members of staff.

So I studied how they reacted when challenging pupils misbehaved. I copied and refined their approach. The exact wording they used.

Before long, I was having success too.

Now, when I asked those same, difficult students from my class to stop talking, they stopped.

I'd learnt scripts that stopped argumentative pupils in their tracks. I'd learnt how to give consequences that changed behaviour.

I felt calm, confident and in control.