How to request a refund for a Roblox purchase?

If you got an email receipt and there's a 'Report a Problem' link in it, use that; otherwise, click here and ask the iTunes Store staff for a refund.

If it wasn't billed through them, contact the provider.

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See this link, but be advised, not all purchases can be refunded --> Request a refund for apps or content that you bought from Apple - Apple Support