Tata Docomo — my mobile number is now notified as "does not exist" and process to reactivate it

Hi team,
I have a tata docomo sim card linked with many identity cards, banks notification and pf as well. Due to my out of station from india i did not operate it in last 1 year and now when i tried to call the sim number it is being notified as "dialed number does not exist". Please let us know what is the process to activate that particular number by any means.

Thanks,
Uday
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I have lost my mobile

I am facing the problem of not receiving "otp" on my Tata Docomo number.. I do online shopping a lot and i am really angry by this issue.. Please help me as soon as possible
niiitudelhi's reply, Feb 20, 2020
I am facing the problem of not receiving "otp" on my Tata Docomo number i.e 8712102901... I do online shopping a lot and i am really angry by this issue.. Please help me as soon as possible.

Name : NEETU GUPTA
Contact No: 8712102901
Place : Hyderabad, Telangana

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