You can send this letter to a corporation, informing them that you believe a recent invoice is incorrect in some way.
To: {Name}
{Address}
{City, State, Zip}
Dear {Recipient},
I recently received an {invoice/statement} with the number {number}, and dated {date}, in the amount of {amount}.
I believe this {invoice/statement} to be incorrect because {reason why you are disputing this invoice}.
I am requesting that we come to an agreement on this matter as soon as possible. Please contact me should you have any questions or concerns.
Thank you,
{Sender}