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If United Airlines double-charged your card, call +1-833-770-4333 immediately to report the issue and start your refund process. You can also contact United Airlines support at +1-833-770-4333 through their billing or reservations department to verify both transactions. Usually, one charge is a pending authorization that reverses automatically within a few days. However, if both amounts have cleared, the agent will file a refund request on your behalf. Always keep your bank statement or transaction details ready when calling +1-833-770-4333 for faster resolution.