Dear …

RE: Invoice # __(reference #)__

Please find enclosed a copy of the above mentioned invoice in the amount of __($__)__ that your company faxed to me on __(date)__. I would like to bring to your attention to a huge error that has been made here.

This invoice is not for services rendered to me, but to someone else. As you will note, the name and address on this invoice does not match mine. In addition to that, the car rental period shown on this invoice does not reflect the dates that I actually rented a car from __(Company Name)__. I had rented a car from you on __(date)__, which I returned to your company on __(date)__.

I am extremely upset and very concerned that your company actually used my credit card to pay an invoice for one of your other clients, without any authorization from me whatsoever! Please immediately reverse this charge of __($__)__ on my __(name of credit card)__ card and advise me, in writing, when the transaction has been completed.

I trust you will give your immediate attention to this matter and I look forward to hearing from you soon.

Yours truly,