Here are previous posts and responses for this very question:
http://www.jiskha.com/search/search.cgi?query=bank+made+a+mistake+on+your+printed+checks
You will find information that you can use in here.
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Your local bank made a mistake on your printed checks. Additionally,
the bank charged you for the checks, even though the order was supposed to be
complimentary for customers opening a new account. How would you draft a letter
that allows your irritation to work for, rather than against, you?
2 answers
Be clear and concise about the problem and how you want the bank to remedy it. Don't blame anyone because it's likely that the person reading the letter had nothing to do with the errors. Check these sites for more information and sample complaint letters.
http://www.infoplease.com/ipa/A0002121.html
http://www.georgia.gov/00/channel_title/0,2094,5426814_39105734,00.html
http://www.infoplease.com/ipa/A0002121.html
http://www.georgia.gov/00/channel_title/0,2094,5426814_39105734,00.html