your address date name and address Dear Sir or Madam: We regret that we cannot vouch for the reliability of ____ (company). Our experience dealing with this firm has been unsatisfactory. During the past ___ (time period) that we have been having a business relationship with ______ (company), they have repeatedly failed to meet their financial obligations. We know that this information will remain in confidence and we hope that it will be helpful to you. Sincerely yours, (name)