Although I purchased my ticket through a travel agency, is it possible to waive the refund fee on the same day of purchase?

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• I have purchased a ticket and although 24 hours has not passed, why is there a refund fee?
• When is reservation change or refund due?
• Tell me about the conditions for exemption of the refund fee.
• Will it be possible for a refund on the same day of ticket purchase?
• It's a double payment. What should I do?