If nothing was unclear or difficult, say so. Skip questions about steps you did not experience; use not applicable where appropriate.

What change did you understand from the notice?
Which date or condition remained unclear?
What information should appear earlier?

Author notes / illustrative keys where applicable:
1. Use this answer to locate the part of the experience that needs explanation. The example issue to investigate is: customers cannot tell when new terms apply.
2. Unclear effective dates and qualifying conditions can lead to different expectations about the same billing notice. Separate each condition in the explanation and verify its source rather than interpreting contractual rights.
3. Turn the requested improvement into a testable next step. One illustrative action is: add an explicit effective-date example.