We would like to show you a description here but the site won’t allow us. 3. Other issues NPCI allows customers to file complaints if they could not fetch or link accounts, remove or de-register UPIs, and seek redressal. NPCI provides a platform to check and register complaints related to transactions routed through its payment systems. Users need to select a product, transaction type, card number, bank name, transaction date, amount and captcha to raise a complaint . Learn how to file a UPI complaint through the official website, toll-free number (18001201740), or e-mail (upihelp@ npci .org.in). Resolve UPI transaction issues with our guide.