I have read where sending your letter directly to an individual at a company will at least insure it is opened withing the company. Letters should be addressed to an individual and not "Complaint Department." Find out who is in charge of whatever it is you're not pleased with, and direct your letter to the department head.
For public companies you can go to their online Annual Report to see who is in charge of what. For
Ford Motor,I found this...
Executive Officer Group
William Clay Ford, Jr.
Executive Chairman and
Chairman of the Board
Alan R. Mulally
President and Chief Executive Officer
Mark Fields
Chief Operating Officer
James D. Farley, Jr.
Executive Vice President, Global
Marketing, Sales and Service and Lincoln
John Fleming
Executive Vice President, Global
Manufacturing and Labor Affairs
Joseph R. Hinrichs
Executive Vice President and
President, The Americas
Stephen T. Odell
Executive Vice President and
President, Europe, Middle East and Africa
Robert L. Shanks
Executive Vice President and
Chief Financial Officer
Raymond F. Day
Group Vice President, Communications
Felicia J. Fields
Group Vice President, Human Resources
and Corporate Services
Bennie W. Fowler
Group Vice President,
Quality and New Model Launch
David G. Leitch
Group Vice President and
General Counsel
Raj Nair
Group Vice President,
Global Product Development
Ziad S. Ojakli
Group Vice President,
Government and Community Relations
Stuart J. Rowley
Vice President and Controller
David L. Schoch
Group Vice President and
President, Asia Pacific
Bernard B. Silverstone
Group Vice President,
Chairman and Chief Executive Officer,
Ford Motor Credit Company
Nicholas J. Smither
Group Vice President and
Chief Information Officer
Hau Thai-Tang
Group Vice President, Global Purchasing