Question

Your company has made an error, to your favor, in the billing of a client. What action needs to be taken?

Answer 1

Whether you're approaching the situation ethically or you just want to cover your mistake in case something happens later, the first thing you should do is report the mistake to the company in question.
Whether your employer accidentally doubled your paycheck or you got 5 iPads from Best buy when you ordered one, the best course of action is to notify whoever made the mistake. In some cases, it will work in your favour, while in others the results may not be so greater, but ultimately no one can accuse you of stealing something or hiding the truth if you've been upfront about everything. Ethically speaking, your obligation is to report the error and then see what the other party wants to do about it.
Generally write a letter to rectify the errror

This is a letter asking a company or organization to correct a billing error. The primary purpose of this letter is to give the company the information they need about how the billing error came to be so that they may correct it. Often, a company may not even know about small errors in consumer accounts and therefore, a formal letter is needed to bring it to their attention.

Sometimes, billing errors are first brought to a company through a telephone call. It is not a bad idea to make such a call, however, it is still very important to put a formal request for a billing error to be corrected in writing in order to keep everything documented and avoid disputes later on.

This letter can be used for any situation in which a billing error needs to be corrected. It doesn't matter whether the letter is being directed at a credit card company or another consumer company, such as a store or credit company associated with a store.