Reference does not mean that you have become guarantor.
It is neither your moral nor social, nor legal obligation to inform anything.
It is not at all anything that can be rated as duty.
Nevertheless you have already informed whatever you knew.
Start recording the calls, and prepare a list of calls received and minutes of discussion on paper and in file too.
Point out that on dated……………………….you have already informed to Mr/Ms…………….who called from phone number…………………………and nothing is knew is known to you and from this moment onwards you are unwilling to receive any phone call. Ask the caller to speak his full name, designation, address, Indian office address, Name of Prop, registration number issued by RBI, phone number, website, email id, fax number etc.
The companies that are calling you shall have most probably a representative office in India too……………..Issue a notice/legal notice with copy to local SHO/Police Commissioner and RBI:
Smt. Uma Subramaniam
Chief General Manager -in-Charge
Department of Non-Banking Supervision
Central Office
Centre I, World Trade Centre, Cuffe Parade
Mumbai-400 005.
Phone: 022-22153350
Email id: cgmicdnbsco@rbi.org.in
THE DETAILED DUTIES OF DNBS CAN BE SEEN AT:
( DNBS: Dept. of Non banking Services)
https://www.rbi.org.in/scripttts/AboutUsDisplay.aspx?pg=Depts.htm#DNBS
YOU MAY ALSO LODGE A COMPLAINT WITH:
. D Subbarao
Governor
Reserve Bank of India
Central Office Building
18th Floor, Shahid Bhagat Singh Road
Mumbai-400 001.
022-22660868
governor@ rbi.org.in
and demand that the license of M/s …………………………..be cancelled.
It shall be fruitful to mark copy to area councilor, MLA, Community leaders and build pressure.
You may find another thread relevant at:
https://www.lawyersclubindia.com/forum/Harrasment-by-icici-banks-recovery-agents-76271.asp#.UUc5U0pFZ_4
Some companies have been supplying list of incoming calls too in itemized bill supplied to customer e.g. Reliance. If this option is available you may opt for MNP and change the operator.