RBL Bank — disapproval of credit card

Address:

Mumbai. Maharashtra, Mumbai City, Maharashtra, 400056

RBL executives use to regularly call up & inform that I have a Pre approved Credit Card, as my Cibil Score was good. So I thought to apply for RBL Credit Card. I also have a Bank account in RBL bank since 2018.
My reference no : # CC11HER1U8. But I received sms saying, regret to inform that my Application is dis-approved as my assessment criteria does not match. I was shocked...
I am having the best banks Credit Card. With on time payments on all Cards. No late payments on my head. I am very disappointed by the working process of RBL...
I think bank is not a Professional bank. With limited sources of working team.
I want to know the reason for my disapproval of card. Than why do the executives call up, to just waste time.
I had in my mind RBL is a very Professional bank with efficient people working for it. Eagerly waiting for a reply or I should close my and my family accounts from RBL.