Tata Docomo — sim card registration failed

My mobile number [protected] shows error as "sim card registration failed". I am very surprised by this. I want to know how this happened and how can i reactivate my sim card? I have a lot of services linked with my number. I want my number at any cost. Please let me know a pragmatic solution as soon as possible.

I am unable to even contact the customer care.
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I'm using [protected] number from last 6-7 years now, Suddenly Service provider blocked my number since I'm not recharging it frequently. when I ported to Tata DoCoMo. I've been told that my number has lifetime validity of incoming. All of sudden they put my number in grace state, please help me. I need my number to be reactivated immediately.
Dear Sir/Madam,

This is to request you that, i am from andhra pradesh State, Anantapur district, i have blocked my tata docomo sim mistakenly while going through the security settings of my handset . now its asking to enter the PUK code... can i please get my sim's PUK code number . please solve my problem as early as posible..

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