Verified: 22 May 2026 05:30 am IST
Industry: Banking & Financial Services (Private Sector)
Jurisdiction: India
Primary Regulator: Reserve Bank of India (RBI)
Important Safety Warning: Beware of the “Reward Points & KYC Verification Scam.” Scammers frequently buy ads on Google and Social Media displaying fake City Union Bank customer care numbers. This is a scam. CUB staff will never ask for your CUB mBank Plus app password, Internet Banking login, ATM PIN, CVV, OTP, or request you to download screen-sharing apps (like AnyDesk/RustDesk) to process a refund or unblock an account.
Level 1: Customer Support (Initial Complaint)
How to complain: Register your complaint (failed ATM withdrawals, unauthorized digital transactions, or branch service issues) directly via the Online Complaint Form on the official City Union Bank website (cityunionbank.bank.in). For immediate telephonic assistance, call their primary centralized national helplines at 1800-120-5000 or 044-7122-5000. You can also utilize their WhatsApp Banking at +91-44-7122-5000, or email the central helpdesk directly at customercare@cityunionbank.in.
Availability: The centralized toll-free IVR, WhatsApp desk, and digital web forms operate 24x7. Branch banking hours are typically Monday to Friday 10:00 AM to 4:00 PM, and alternating Saturdays.
Timeline: City Union Bank must acknowledge digital payment failure complaints immediately. According to their grievance policy, they aim to resolve standard Level 1 queries and branch-level issues within 7 working days from the date of receipt.
Level 2: Internal Escalation (Grievance Officer / Nodal Officer)
Who to contact: If Level 1 support fails, your refund is stalled, or you receive an unsatisfactory resolution after 7 days, you must formally escalate. You must email the Grievance Officer directly at complaints_grievances@cityunionbank.in. You must include your registered mobile number, Account Number, and your Level 1 Service Request Number. You can also call the grievance desk directly at 0435-2402322.
Timeline: Under RBI banking regulations, the internal grievance officers must acknowledge escalated disputes and prioritize the matter to provide a reasoned resolution within 10 working days from the date of Level 2 escalation.
Level 3: Regulatory Authority (Principal Nodal Officer & RBI Ombudsman)
Pre-Ombudsman (Level 3A): If the Grievance Officer fails to resolve the issue, you have one final internal step before approaching the RBI. You must escalate the matter to the Principal Nodal Officer (PNO) at complaints_grievances@cityunionbank.in (Attention: Principal Nodal Officer). Written legal notices and formal corporate grievances can be sent to their Headquarters (City Union Bank Ltd., No. 24 B, Gandhi Nagar, Kumbakonam, Tamil Nadu - 612001).
Authority (Level 3B): If the CUB PNO rejects your claim, fails to provide a satisfactory resolution, or the total time since your initial complaint exceeds 30 days, you must escalate the matter to the banking regulator. (Note: The RBI is rolling out the upgraded RB-IOS framework on July 1, 2026, which tightens the post-rejection filing window strictly to 90 days!)
Portal/Contact: You must submit your grievance to the Reserve Bank of India under the Reserve Bank - Integrated Ombudsman Scheme (RB-IOS). Complaints must be filed through the centralized Complaint Management System (CMS) portal at cms.rbi.org.in. Alternatively, you can call their central helpline at 14440 or email the processing center at crpc@rbi.org.in.
Level 4: Legal Action (Final Step)
Pre-Litigation: Financial service deficiencies fall under the Consumer Protection Act, 2019. The RBI Ombudsman and the National Consumer Helpline (NCH - 1915) act as your final administrative mediation steps. Since City Union Bank is a private commercial bank, bypass CPGRAMS and strictly rely on the NCH for pre-litigation.
Court/Arbitration: If you have suffered significant financial loss due to banking negligence or systemic failures that the Ombudsman could not fully resolve, you must file a formal complaint with the appropriate Consumer Disputes Redressal Commission using the newly integrated e-Jagriti portal (e-jagriti.gov.in).
Timeline: You must file the consumer case within two years from the date the cause of action (the financial service failure) occurred.
Community Action: Is City Union Bank refusing to reverse a failed IMPS transaction, or are you looking for the correct template to formally escalate an unauthorized credit card charge to the Kumbakonam Headquarters? Reply below (do not share your passwords, bank details, or your exact Account Numbers), and our community will point you to the right resources!