if HDFC rejects your Credit card.

just email them asking why you were rejected. they will not send a reason but list of documents you need to re submit. either your residence proof or most probably your Office address in case you have your own business.

i gave my home address as office address and resubmit the document to a HDFC bank near me, they said we will courier it to chennai office.

got my card approved this way and for my wife too. so dont be scared if they asked you to re submit the documents, write a letter and your aplication no along with the documents.

TLDR:- if rejected . Email hdfc and send documents if that s what they want .