Your question is Correcting a Client Account Mistake. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a specific time you made an error on an account. How did you discover it, how did you communicate it to the client and internal stakeholders, and what steps did you take to fix the issue and prevent it from happening again?