HDFC Bank — otp not received in email

Address: 369, Sai Sadan Bldg Main Rd, Kamaraj Nagar, Tamil Nadu 600071

Website: netbanking.hdfcbank.com/netbanking

Have to reset my net-banking pin. There are 2 options :

1) registered number + debit card — i can't use this because i dont have the debit card.

2) registered number + e-mail : now the problem is 3 digit otp comes to the registered number but the email never arrives, i dont know why is it happening. Why hdfc bank is incapable in this matter in the present modern world!