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How can I confirm an agreement discussed by phone or in person?

Ask for clarification when you are unsure about exact wording. Keep copies of the seller's response with the order records.

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Check whether the evidence concerns the actual product rather than a related offering. Look for relevant limitations in the full documentation.

How should I interpret a seller's deadline when the time zone is unclear?

Ask which time zone applies to the stated deadline. Confirm the deadline again if the arrangement has been amended.