I cannot provide legal advice or determine the validity of evidence in a dispute, as the admissibility of evidence can vary based on the jurisdiction and specific circumstances of the dispute.

In general, it may be helpful to keep a record of conversations with clients, especially if they pertain to the project's scope, requirements, deadlines, or payment. Keeping records of conversations can be useful in case of disputes or misunderstandings.

If you want to use the conversation as evidence in a dispute, it is important to consult with a legal professional who can advise you on the admissibility of the evidence and the proper way to present it in court or in arbitration. Additionally, some freelance platforms have their dispute resolution procedures and guidelines, and you may want to check their terms of service before taking any action.
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