Year 2008 onward Batches conducted under Symbiosis International University (SIU) to be referred to SIU as per their instructions on web site www.siu.edu.in or contact 020-39116224/25.
The procedure of issue of above mention documents will be on follows for PGDM 1993 to 2007 Batches:-

Application for issue of duplicate Diploma Certificate or Mark sheet (PGDM) with reason signed by the candidate and affidavit on Rs.100 stamp paper notarized or FIR.
Photocopy of certificate (If held) & mark sheets with the application.
Father’s Name & Date of Birth of Candidate. (for Duplicate Diploma only)
Rs. 1500/-, processing fee for issue of duplicate Certificate/Mark sheets and add Rs. 250/- postal/courier charges with in India.
Minimum 15 days’ time would be required to complete the duplicate issue process.
You may send payment of the fees through DD made in favor of "Director SIMS" payable at Pune or pay in cash with the Accounts Department.