Why did I receive an email stating that my number is blocked?
You need to map an active mobile number with your stock broker. This allows your stock broker and the exchanges to share communication related to your account.
SEBI requires the mobile number to be updated if the registered number has been disconnected. We check this using the list of permanently disconnected numbers updated by TRAI. You can check this circular for details.
You can learn how to map your new mobile number on Console in this article.