your street city, state, zip) (date) (name street city, state, zip) Dear ____ (name): Is there a reason why you haven't paid? Is there a reson why you haven't written? Is there a reason why you haven't phoned? Is there a reason why you have ignored your bills? I am sure not! Please mail your check today for ____ (amount), covering invoices _______, _________, and _______ (invoice numbers). Sincerely, (name) (title)