I just called 1909 and got a message that DND is activated.
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call 1909, press3, press1, press1 and again press 1
Hello it is better to call customer care number. It is only option.
DND (Do Not Disturb) Service is the way to activate and deactivate these unsolicited Call and SMS on your mobile number. All telecom network service provider company send these promotional message on the following topics.