RBL Bank — credit card denied without any reason

Address:

New Delhi, Delhi, 110059

Hi,
Rbl bank execute contacted me for credit card. They said you have a very good cbil score and you are elligible for our credit card. They have taken all the documents and done all kind of verification. My application reference number is #cc2y8a1u5p.
They even called twice on my number and had successfully completed all kind of verification.
Now today suddenly i got a message that my credit card application is denied as it didn't meet that policy requirements of rbl.
Now when i contacted customer care to know the exact reason.. No one is ready to tell me the reason. Someone is saying your application is approved, and someone is saying your application is denied without giving me any reason. I know according to rbi guidelines, i have the right to know the reason of this decline and no one in rbl is giving me a reason for this. Is this a kind of scam or a kind of
Joke. I thinking of filing a legal complaint against this bank.
Please help if anyone has any idea about this

Thanks