If you have any personal association with the policymaker, let her or him know. Nothing is more effective in getting a policymaker's attention than letting them know you've worked on her or his campaign, or that you're a longtime customer of their business or a major buyer of their product. Use your business or organization letterhead stationery if you have any, and if you are representing the organization in your complaint. Legislators say that phone calls and letters carry equal weight. In general, try to avoid sending letters by fax.
Many congressional offices find a fax intrusive and prefer letters that arrive by mail.
Faxes to large companies may or may not get routed to their intended destination. Write or call a second time. Follow-up letters can have a much stronger impact on policymakers and their aides than the initial communication.