Mahanagar Telephone Nigam [MTNL] — phone always shows switched off when someone call

Address:

New Delhi, Delhi, 110037

Sins the last two year my mtnl delhi phone can not received call nor make call.[protected].

Another data card number not working for the last two years. [protected]
Despite network, inside home, calls can be made from outside the home. Data card operated inside home as it is usb port based.
Complaints also made to mane delphi throughcostomer care.