After going through several posts on the CardBhai forum, we would like to advise you folks that, kindly De-link your credit card attached to your HDFC Bank Savings Bank Account.
What HDFC Bank Credit Card DSAs do is, they link the credit card account to your savings bank account. Advantage is, you have authorized them to take money out of your savings bank account to fulfill your payment obligation towards credit card. And the disadvantage is if there is any problem with Credit Card and if the bank decides to freeze your savings bank account then your salary etc will be locked up, cheques start bouncing. So we advise you to de-link the Credit Card account and Savings Bank account.
For our readers, we have uploaded a MS-Word Document which you can edit and submit to your Bank as well as HDFC Credit Cards division [I am in Bangalore and I had to send the letter to Chennai. Call Customer Care and ask where you have to send]. Make sure you have an acknowledgment of the letter.