If they are giving threats on mobile then, you can report it to police, same complaint you can forward to SP, so they can take action.
You can write to LSA of Assam in details.
their Address is
The Gauhati High Court Legal Services Committee
Gauhati High Court
M.G. Road, Guwahati 781001
Telephone :(0361) 2735868, 2735869, 2637179, 2600008
Fax :(0361) 2735863, 2735867, 2732541, 2734346
E-mail : [email protected]
http://ghclsc.gov.in/ You can submit complaint on their website too. as they have to Help senior citizens as per their rules.
Also submit complaint on http://ncw.nic.in/