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 apologize for repaying someone late, use this factual base: state the amount, agreement, transaction, and current shortfall without hiding behind vague language.
Correct the record precisely
Correct only what you can support, acknowledge any real impact, and propose a practical way to prevent repetition. Offer a written repayment, correction, or reporting plan with realistic dates and records. 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 ask for trust before the numbers are clear or make a promise that depends on uncertain income. Use qualified financial, legal, banking, or fraud support when ownership or authorization is disputed. Do not recruit an audience, publish private evidence, or turn a misunderstanding into a campaign about character.