Recently upgraded my existing credit card to LTF DCB under alumni offer. I mailed them for upgrade for which they said that I need a minimum credit limit of 5L which I didn't have. I told them that I can present my salary slips to show that I satisfy the income criteria to which they agreed. They upgraded my card but my credit limit hasn't increased for almost a year and my request for LE has been constantly rejected. What can be done in this case?