This letter should be sent certified mail, return receipt requested if you anticipate a small claims action arising from the transaction.
1234, Main Street
Boston, MA 02123
06 April, 2005
<Recipient Address Goes Here>
On <date of purchase>, I purchased from <seller> <item purchased>. Unfortunately, I am not satisfied with this product because of <reason for dissatisfaction>. Accordingly, I would request that you <desired action>. Please contact me as soon as possible to arrange for this solution. Thank you.
encl: <List of enclosed items goes here>