HDFC Bank — not able to log in hdfc net banking

Address:	Kolkata, West Bengal, 700020
Website:	netbanking.hdfcbank.com/netbanking/entry

Dear Sir,
I am not able to log in HDFC netbanking using Customer ID & password. They have incorporated new feature during log in where they will send OTP to my registered mobile number.
I have entered all the credential to log in but never receive the OTP to log in. I call the customer care center but the issue not resolved.
I have never faced this issue before. I have been using HDFC netbanking since 2008. This is the first time facing the issue.
I have to do whole lot of things with my account like payment of electricity bills, students school fees, etc.
Kindly help me resolve the issue on urgent basis.