RBL Bank — credit card rejection without clear reason

I received a call from rbl credit card department & i agreed to proceed for credit card. After several days chasing up to the team, some of the team says your card has been approved, some of them says it is in process, some of them said that within few days your card will be delivered. But today i saw that you doesn't meet policies with rbl bank. How it's possible that when i was waiting for confirmation then i got rejection even there is no clear reason for rejection.
I have a strong cibil background too.
I am going to file a complaint against rbl, it's the matter of my precious time wasted due to rbl processing unit.