A quote, a warranty, and a contract are different papers, and the conversation that came before them is a fourth thing. The promise that matters most is often the one someone made out loud and nobody wrote down. Before you sign, find where that promise lives on paper. If it is not written down, you will have a hard time pointing to it later.
What an entire-agreement clause does
Many written agreements include a clause saying the document is the whole agreement between the parties and replaces earlier discussions. You may see it called an entire-agreement or integration clause. Read it closely. It tells you that the signed page is the reference point for everything, and that a statement made at the counter or on the phone is not part of that page unless the page says so.
Get the statement onto the page
If someone tells you something that matters to your decision, ask for it in writing. That might be a line in the contract, a note attached to the quote, or an amendment that states what changed. Ask that the written version be signed or initialed by the person who made the statement, and keep a copy in the folder with the rest of the paperwork.
Check the wording of any change clause
Look for language saying that changes must be in writing and signed by both sides. Those clauses protect you as much as the provider, because they tell you that a phone call does not alter the terms. Ask how a change is recorded, who signs it, and where the signed version is kept.
Keep your own notes
Write down what was said, who said it, and the day it was said. Keep that note with the quote and the signed page. A personal record of a conversation is not a substitute for the contract, but it tells you what to ask for when the paper does not match what you remember.
This is a plain explainer of how these papers usually work, not advice on any particular agreement. For what a contract covers and how it ends, read the other guides on this site and check the published figures in its tables.