Keep a simple chronology.
Create one record with four columns: date, event, person or company, and supporting document. Add the important interactions in order. Keep your recollection separate from a direct quotation or a statement supported by a document.
Save the complete conversation.
Preserve email threads, text messages, letters, and attachments. Screenshots can be useful, but keep the original message or file where possible. Include dates and the sender’s details. Save voicemails you have already received, and ask about applicable rules before recording a call.
Connect each concern to a record.
Match a disputed payment to a bank receipt. Match a performance promise to the proposal. Match a repair concern to a dated photograph or service order. The goal is to make the issue easy to understand, not to create the largest possible folder.
Record the impact.
Keep invoices, denial letters, repair estimates, or other records of the consequences you have experienced. Separate amounts you actually paid from estimates or anticipated expenses. Explain impacts that are not easily captured by a receipt, without exaggeration.
Preserve rather than edit.
Keep original files and work from copies. Do not change messages or mark up your only copy of an agreement. If you need to explain a document, use a separate note. Keep sensitive records somewhere secure, and ask how the firm wants to receive them.
Bring unresolved questions.
You may not know why a balance changed or which company is responsible. Write down those questions. Uncertainty is something to investigate, not something you need to solve before requesting a review.