[Bonnyboy]

Google “ How to write a Complaint letter”..you can even get templates, best to pick out what you think are the good bits from the various sites though…bugger the template. Try Here

Think the main rules are to make sure it is marked as Complaint, that way they are under no misapprehensions, keep it short, polite and to the point, don’t get sidetracked. Send it recorded deliver too. Also keep a copy.