You accidentally charged a long-term client $500 more than the correct amount. The client has already paid.

**Question:**
You work as an accountant. You accidentally charged a long-term client $500 more than the correct amount. The client has already paid. Write an email to the client, Mr. Thompson. In your email:
– Apologize for the error
– Explain how the mistake happened
– Tell him what you will do to fix it

**Model Answer:**

**To:** mr.thompson@email.com
**Subject:** Apology and correction – overcharge on invoice #492

Dear Mr. Thompson,

I am writing to sincerely apologize for an error on your most recent invoice (#492), dated June 10th. I mistakenly charged you $1,200 instead of the correct amount of $700. I realize this is a serious mistake, and I am very sorry for the confusion and inconvenience this has caused you.

The error occurred because I copied the wrong rate from an old file. Your current rate was updated in my system last month, but I accidentally used last year’s higher rate when preparing the invoice. This was entirely my oversight, and there is no excuse for it.

I have already processed a refund of $500 to your credit card on file. You should see the amount reflected in your account within 2 to 3 business days. I have also attached a corrected invoice for your records. Going forward, I will implement a double-check system for all invoices before they are sent to you.

Please accept my sincere apologies once again. If there is any other way I can make this right, please do not hesitate to let me know.

Sincerely,
Linda Park