Nine kinds of evidence in a consumer dispute, ranked by how well they hold

Most people preparing a complaint assemble evidence that shows they were treated badly. That is a different thing from evidence that decides a dispute. What decides one is material that is dated, that came from outside your own account of events, and that a reasonable third party cannot easily explain away.

Ranked from the strongest downward, with what makes each one weaker than it looks.

1. The signed contract or written terms

Everything else is interpreted against this. A signed agreement, a purchase order with terms attached, or the terms and conditions you accepted at checkout sets the standard the other party promised to meet. Any dispute where the contract clearly addresses the issue is largely over before it starts.

Weakness: people frequently have not read theirs, and the clause that governs is often not the one they expected. Read yours completely before you complain, including anything incorporated by reference, because discovering an unhelpful clause after you have taken a position is worse than knowing about it beforehand.

2. Contemporaneous written communication

Emails and texts sent at the time, in ordinary course, with their timestamps intact. These are strong precisely because they were not created for the dispute. An email from March asking when the crew is coming back proves both that the work was unfinished and that you raised it.

Weakness: partial threads. Producing three messages out of a conversation of thirty invites the question of what the other twenty-seven say. Keep and produce the whole exchange.

3. Proof of payment

Bank records, card statements, cleared checks. Independent, dated, and generated by a third party with no interest in the outcome. They establish what was paid and when, which is frequently the disputed fact.

Weakness: they show only that money moved. A payment record does not show what it was for, which is why an invoice reference or a note on the payment is worth adding at the time.

4. Dated photographs and video

Very strong for physical conditions, and much more so when a sequence exists: before, during and after. Include something for scale, capture wide shots that establish location as well as close shots of the problem, and keep the originals with their metadata rather than only screenshots or messages you sent them in.

Weakness: a photograph of a defect proves the defect exists, not who caused it or when it appeared. A single undated close up of damage is much less useful than people assume.

5. An independent inspection or expert report

A written assessment from someone qualified and unconnected to either party carries substantial weight, particularly on questions of workmanship where the disagreement is technical. It converts your opinion into a professional finding.

Weakness: cost, and choosing badly. An assessment from a company that also wants to sell you the repair is discounted heavily and reasonably. Pay for an inspection from someone who does not do the remedial work.

6. The original advertisement or product description

What was promised at the point of sale. Screenshots of a listing, a printed brochure, a specification sheet, or an emailed quote. This decides most disputes in the not as described category, because the standard is what was represented rather than what you hoped.

Weakness: online listings change. Capture the page as it appeared, with the date visible, rather than planning to go back for it later.

7. A written record of a phone call

A note made immediately after a call giving the date, the time, who you spoke to and what was said is genuinely useful, and much better than nothing. Better still is an email sent straight afterward confirming your understanding, which converts a recollection into a contemporaneous document and gives the other party a chance to correct it.

Weakness: it is still your account. Recording laws vary by state and some require the consent of every party to the call, so recording without checking your state's rule is a bad plan.

8. Comparative quotes

Two or three written quotes from other providers for the same remedial work. These do not prove liability at all, but they establish the value of the loss, which is what a settlement discussion or a small claims judgment actually turns on once fault is accepted.

Weakness: quotes for different scopes are not comparable. Ask each provider to price the same defined scope, or the spread between the numbers will be telling you about the scopes rather than about your loss.

9. Recollection, and other people's opinions

Your memory of what was said, a neighbor's view that the work looks poor, and posts from strangers online describing similar experiences all sit at the bottom. They are not worthless, but they persuade nobody who is deciding between two accounts.

The strengthening move is to convert recollection into something dated, which is why the email after the phone call matters so much and why writing down what happened on the day it happens is the cheapest evidence practice there is.

Assembling it

Put everything in date order in one folder, number it, and write a one page chronology that references the numbers. The Consumer Financial Protection Bureau and state consumer agencies both take complaints in this format, and so does a small claims court.

The exercise has a second benefit that people notice afterward. Laying the material out in order shows you quickly whether you have a case built on documents or a case built on how strongly you feel, and that is worth knowing before you spend a month pursuing it.