Bharat Sanchar Nigam [BSNL] — number deactivated which i am using. no sms/ call before deactivation

Address:

East Godavari, Andhra Pradesh, 533004

Number was deactivated without giving information in sms or call. When contacted different branches in kakinada by my parents they told that number was deactivated by main office in hyderabad. They gave no reason why its deactivated and they did not gave in which state it is. They are claiming now that number is taken by another customer and he did not activate it still.
My number linked to all the accounts now and not with me anymore. I am customer from almost more than 10 years now.
My number is [protected]. Linked to andhra pradesh. Please help me to get my number back of raise grievience. I am unable to go through any ivr of bsnl it goes in loop and disconnect after some time.