Hey @muzammilsheikh, RBI has given around 6 months to implement the new changes i.e. to change the credit card network. Also, based on what I have read, the existing credit card network might only be changed on card expiry/renewal.
It depends on the fact that whether the card you have is available on the Rupay network or not. For example ICICI Amazon Pay card is only on visa network and not on MasterCard or Rupay network so in that case Bank will not be able to change it. But if you card is available on the Rupay network and still bank is not changing it you can raise a RBI ombudsman complaint and get it done if you want it sooner else wait for the bank to implement the changes in the next 6 months.