Where to complain for wrong UPI payment?

First, raise a complaint directly through your bank's mobile app or your UPI app, such as Paytm, by navigating to the 'Support' or 'Grievance' section and selecting 'UPI Complaint.' If the issue remains unresolved after 15 days, you can escalate the complaint to the National Payments Corporation of India (NPCI) via their Dispute Redressal Mechanism portal or by calling their toll-free number 1800-120-1740.