1234, Main Street
Boston, MA 02123
<Recipient Address Goes Here>
During the past <time period> we have <nature of problem>. Have you experienced this problem with other customers?
I’m sure that this isn’t the level of service you intend to provide and will remedy the situation immediately. I would like <nature of remedy>.
Please advise me on how you propose to resolve this situation as soon as possible. I look forward to hearing from you.
encl: <List of enclosed items goes here>