HDFC Bank — Company Denying card

Address:

North West Delhi, Delhi

I have applied for an HDFC credit card at least 3 times but the bank always fills up the form and thereafter there is no response from them, either for the field inquiry or in any other form. They are denying me this card though I am a preferred customer of this bank. My guess is because I belong to the Armed Forces... though the Bank is just non committal. Please advise what legal action I can take against the Bank