Hi
A lot has been discussed regarding this on the forum, you can try searching for it. In summary, you can try your luck by sending the attached form and concerned documents to:
1.
grievance.redressalcc@hdfcbank.com
2. Dropping the docs at the credit card dropbox in any branch (which finally end up at their Chennai office)
3. Mailing directly to their Chennai office address.
In the above order if the previous method fails. (sometimes luck is factor, as in which executive lands your application)
Apparently, they only consider credit cards from SCB, Axis, CIti, Hsbc and Deutsche for C4C method. But some members have used other cards and succeeded as well.
Do update us on the result.
Link to form:
LE Form