HDFC Bank — Very poor Customer service

Address:	Thiruvananthapuram, Kerala
Website:	www.hdfcbank.com

Before leaving India, I updated my overseas mobile number with HDFC Bank through the application procedure (which is paper based, don't know why that is still paper based!) The bank employee updated it wrong. Now I am unable to generate OTP, etc and my account/net banking is disabled. On calling customer care they ask me to go to bank/ATM to update. How will I go when I am not in India? Pathetic service. I have raised complaints but haven't got single response till now, even over email. ICICI Bank is much better in that regard. I faced an issue here and they were ready to help.