If you accidentally send money to the wrong UPI ID, immediate action is crucial for recovery. First, verify the transaction details, including the unique transaction ID. Then, raise a complaint within your UPI app, selecting an option like 'Sent to wrong person.' Contacting your bank immediately is vital; they can initiate a process with the recipient's bank. While banks cannot force a reversal without consent, cooperation from the recipient, sometimes facilitated by direct contact if possible, often leads to money being returned.