Tata Docomo — sim not working

Docomo has stopped service on my number without any notice. From 1 dec my outgoing and incoming call is working and no signals also. How they can stop the service without any notice. I am using that number from last 6 years and now they suddenly stop the service. Now please tell me how i can port my number to airtel or vodafone because i am not able to send the sms now. Please take the action against them asap. There customer care number is also not working. My number is [protected]
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I am not able to send message to 1900 for MNP.
I have lost my sim card. Hence I want to block my sim card.
Sim.no.:[protected]
Please help me block my sim card as it is personel
I lost my sim and my mobile

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