Jack Martinez
456, X Street, Y Avenue,
Fillmore, UT-84631
(123) 456-7890
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Jack Martinez,
The bill for the training materials we ordered just arrived today. Before we settle the amount, though, could you please check if this is correct? We ordered three sets of your premium package, which means we should have only been charged $300. However, the bill we received today is for $400. Please look into this matter and make the necessary adjustments so that we can make the payment immediately.
Sincerely,
Arland