Hdfc being a front runner in providing housing loans surprisingly lags behind all other players with respective to the convenience of customer.
For everything you need to visit there branch and deal with pathetic customer service.
I have visited branch for below services which could have been done online -
Pay upfront payment.
Reduce interest rate
Reduce duration of loan.
Also dont expect any reply from there customer service on mails. I had loan with SBI and the experience is a big contrast.