Check your mobile number status of Dont disturb online:
Customers- Customers (landline and mobile) who do not want to receive commercial communications can dial or SMS to 1909 (toll free) and register in either of the two categories:
Fully Blocked Category- stoppage of all commercial Calls/SMS
Partially Blocked Category- stoppage of all commercial Calls/SMS except SMS from one of the opted preferences
After registering you can verify the status of your mobile number if it is in DND list by clicking here