Make room for the other version
Ask what the other person understood before assuming that you are arguing about the same facts. For a message about how to resign from a volunteer role, use this factual base: state the role, agreement, effective date, unfinished work, property, access, and any transition obligation.
Correct the record precisely
Correct only what you can support, acknowledge any real impact, and propose a practical way to prevent repetition. Give a clear ending, complete the required handoff, and name what support you can realistically provide. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Agree on a testable next step
Do not disappear, promise indefinite availability, or use the ending to relitigate every grievance. Follow contracts, safeguarding, data access, employment, custody, and legal requirements before the role ends. Do not recruit an audience, publish private evidence, or turn a misunderstanding into a campaign about character.