SBI is not converting to LTF

I requested to convert my Cashback credit card to LTF but they are not approving it. I already hold 2 more cards and Car loan and Salary account with SBI only but still got declined. Any suggestions if this can be done?

I requested to convert my Cashback credit card to LTF but they are not approving it. I already hold 2 more cards and Car loan and Salary account with SBI only but still got declined. Any suggestions if this can be done?