1234, Main Street
Boston, MA 02123
31 March, 2005
<Recipient Address Goes Here>
<date of repair> I brought my <vehicle name, year, etc.> to <location of work> for <kind of repair work>. I was helped by <mechanic name>, who seemed to do a good job at the time. Now, however, I feel that <problem with work>.
Clearly, <location of work> <problem with work>, and I think I am entitled to a partial or full refund of my money. Please contact me immediately upon receiving this letter so that we may resolve this matter. Thank you.
encl: <List of enclosed items goes here>