MTS / Sistema Shyam TeleServices [SSTL] — mts data card: not able to deactivate and no customer support

I am holding mts mblaze data card which is not working now but paying the bill from past two months.
Tried to contact the customer care which always says busy from past one month. Even i am not able to send a mail to customer support, when ever i send a mail, it bounces back.

Data card number: [protected]

Please help me in deactivating my data card.
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    MTS / Sistema Shyam TeleServices [SSTL] Phone
    +91 12 4481 2500 [Corp. Office]
    MTS / Sistema Shyam TeleServices [SSTL] Address
    MTS Towers 334, Udyog Vihar, Phase-IV, Gurgaon, Haryana, India - 122001
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