2. Leave a voicemail. If voicemail is full, press "0." This will typically connect you to a receptionist who may be able to take your message or transfer you to a voicemail that isn't full.
3. Call the national office, if you can't get through. Or to see if you can get a real person.
4. Be prepared to give your name and your location. You can refer to yourself as a constituent, as per the script, and they might not ask.
5. Note that the operator is likely using some kind of form to mark your call, the goal is to generate a high volume of calls that require the operator to check off individual boxes. That means it's critical to name your issues specifically and not just say something like "oppose Trump."