Acknowledge the disputed charge
When to use: Use it as your opening reply the moment a customer flags a charge they did not expect.
When to use
customer name has just flagged a charge of charge amount they did not expect.
Script
Thanks for flagging this, customer name -- a charge of charge amount you were not expecting is worth sorting properly, and I will get to the bottom of it with you now.
I am not going to defend anything before I have looked. Right now I am immediate action so I can see exactly what this charge is and why it landed.
Give me about time estimate to pull it up. If it turns out to be an error on our side, I will fix it, and if it is a legitimate charge, I will show you clearly what it was for -- either way you get a straight answer.
You do not need to do anything while I look. Stay with me here and I will come back with something concrete rather than a brush-off.